<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2021 Workiva-->
<!--r:f31ccbd5-be88-41fd-b580-f6bb2190d17f,g:644d845d-ad02-43bb-a30f-f1225b464410-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.glpropinc.com/role/CondensedConsolidatedBalanceSheets" xlink:type="simple" xlink:href="glpi-20210630.xsd#CondensedConsolidatedBalanceSheets"/>
  <link:definitionLink xlink:role="http://www.glpropinc.com/role/CondensedConsolidatedBalanceSheets" xlink:type="extended" id="ia26cea39be4d45979fc841fb45641f53_CondensedConsolidatedBalanceSheets">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_1e5c0da7-ab0a-4f0f-bb00-1e7482f3fc69" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_c3c1b4c6-1c5e-425d-a827-b40666d3f47e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1e5c0da7-ab0a-4f0f-bb00-1e7482f3fc69" xlink:to="loc_us-gaap_AssetsAbstract_c3c1b4c6-1c5e-425d-a827-b40666d3f47e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateInvestmentPropertyNet_f0e885f0-ee53-487d-bea7-4643d807d9c4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateInvestmentPropertyNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_c3c1b4c6-1c5e-425d-a827-b40666d3f47e" xlink:to="loc_us-gaap_RealEstateInvestmentPropertyNet_f0e885f0-ee53-487d-bea7-4643d807d9c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_d1f1370b-1b63-4038-8b37-3883f60e1c39" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_c3c1b4c6-1c5e-425d-a827-b40666d3f47e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_d1f1370b-1b63-4038-8b37-3883f60e1c39" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsHeldForSaleLongLivedFairValueDisclosure_3aac9304-81fd-4ca1-8f47-844a05053d9d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsHeldForSaleLongLivedFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_c3c1b4c6-1c5e-425d-a827-b40666d3f47e" xlink:to="loc_us-gaap_AssetsHeldForSaleLongLivedFairValueDisclosure_3aac9304-81fd-4ca1-8f47-844a05053d9d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Land_87661487-26e5-4307-8209-47807b641a88" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Land"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_c3c1b4c6-1c5e-425d-a827-b40666d3f47e" xlink:to="loc_us-gaap_Land_87661487-26e5-4307-8209-47807b641a88" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_0b1df8b7-6646-48b9-9756-77dec394ea24" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_c3c1b4c6-1c5e-425d-a827-b40666d3f47e" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_0b1df8b7-6646-48b9-9756-77dec394ea24" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GroundLeasesNet_994b1109-91c9-4fe8-9b6e-ef3bbd7c3569" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GroundLeasesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_c3c1b4c6-1c5e-425d-a827-b40666d3f47e" xlink:to="loc_us-gaap_GroundLeasesNet_994b1109-91c9-4fe8-9b6e-ef3bbd7c3569" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_7c7331ae-cf89-4a09-ad01-001ef95ac27b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_c3c1b4c6-1c5e-425d-a827-b40666d3f47e" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_7c7331ae-cf89-4a09-ad01-001ef95ac27b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseCurrentAndNoncurrent_cd711238-3111-4195-bbfc-76639edc67bf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PrepaidExpenseCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_c3c1b4c6-1c5e-425d-a827-b40666d3f47e" xlink:to="loc_us-gaap_PrepaidExpenseCurrentAndNoncurrent_cd711238-3111-4195-bbfc-76639edc67bf" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_0a33289d-34f3-4a14-80ef-30af2d1275c4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_c3c1b4c6-1c5e-425d-a827-b40666d3f47e" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_0a33289d-34f3-4a14-80ef-30af2d1275c4" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets_3dde105c-b159-4dd8-90ed-fcbeb3ec63ee" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_c3c1b4c6-1c5e-425d-a827-b40666d3f47e" xlink:to="loc_us-gaap_OtherAssets_3dde105c-b159-4dd8-90ed-fcbeb3ec63ee" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_44bd65fd-3917-4c1c-8f58-b969d54cd315" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_c3c1b4c6-1c5e-425d-a827-b40666d3f47e" xlink:to="loc_us-gaap_Assets_44bd65fd-3917-4c1c-8f58-b969d54cd315" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_a2e977ea-5a54-4114-b0f0-ddf9b2a76e4e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1e5c0da7-ab0a-4f0f-bb00-1e7482f3fc69" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_a2e977ea-5a54-4114-b0f0-ddf9b2a76e4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrentAndNoncurrent_754cfd9c-cee4-44b6-b4a1-d3e0da423a6e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsPayableCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_a2e977ea-5a54-4114-b0f0-ddf9b2a76e4e" xlink:to="loc_us-gaap_AccountsPayableCurrentAndNoncurrent_754cfd9c-cee4-44b6-b4a1-d3e0da423a6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrentAndNoncurrent_1d4b8e00-37e9-40a7-8b5a-39efeb3ed892" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedLiabilitiesCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_a2e977ea-5a54-4114-b0f0-ddf9b2a76e4e" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrentAndNoncurrent_1d4b8e00-37e9-40a7-8b5a-39efeb3ed892" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPayableCurrentAndNoncurrent_8cea07b8-80c6-4e22-bba4-4e5afedd93ea" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestPayableCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_a2e977ea-5a54-4114-b0f0-ddf9b2a76e4e" xlink:to="loc_us-gaap_InterestPayableCurrentAndNoncurrent_8cea07b8-80c6-4e22-bba4-4e5afedd93ea" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent_51dc8c8f-c492-40c5-a3e6-cb8911e5df84" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_a2e977ea-5a54-4114-b0f0-ddf9b2a76e4e" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent_51dc8c8f-c492-40c5-a3e6-cb8911e5df84" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent_49f11104-1711-4413-9534-f5f44caaf9d8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_a2e977ea-5a54-4114-b0f0-ddf9b2a76e4e" xlink:to="loc_us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent_49f11104-1711-4413-9534-f5f44caaf9d8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_d287c9dd-c177-48de-b24d-b371e6a8642c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_a2e977ea-5a54-4114-b0f0-ddf9b2a76e4e" xlink:to="loc_us-gaap_OperatingLeaseLiability_d287c9dd-c177-48de-b24d-b371e6a8642c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_4682eccf-6e37-4e01-b67f-15923c873e0a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_a2e977ea-5a54-4114-b0f0-ddf9b2a76e4e" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_4682eccf-6e37-4e01-b67f-15923c873e0a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredRevenueLeasesNet_52e6955e-3ac8-4f34-bb37-3557e9f8f41b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredRevenueLeasesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_a2e977ea-5a54-4114-b0f0-ddf9b2a76e4e" xlink:to="loc_us-gaap_DeferredRevenueLeasesNet_52e6955e-3ac8-4f34-bb37-3557e9f8f41b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_81c4ee61-ca60-438d-84b6-def22dd82ddd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_a2e977ea-5a54-4114-b0f0-ddf9b2a76e4e" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_81c4ee61-ca60-438d-84b6-def22dd82ddd" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilities_b0ea6772-c110-4212-a926-73bae7b1c0be" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_a2e977ea-5a54-4114-b0f0-ddf9b2a76e4e" xlink:to="loc_us-gaap_OtherLiabilities_b0ea6772-c110-4212-a926-73bae7b1c0be" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_9c971294-f7e3-4c0e-bde2-09a01972dd72" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_a2e977ea-5a54-4114-b0f0-ddf9b2a76e4e" xlink:to="loc_us-gaap_Liabilities_9c971294-f7e3-4c0e-bde2-09a01972dd72" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_8d96f896-da60-483e-8dd9-fb43ef312832" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1e5c0da7-ab0a-4f0f-bb00-1e7482f3fc69" xlink:to="loc_us-gaap_CommitmentsAndContingencies_8d96f896-da60-483e-8dd9-fb43ef312832" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityAbstract_20b8231d-52ea-4824-a6b8-15b2dbb764d4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1e5c0da7-ab0a-4f0f-bb00-1e7482f3fc69" xlink:to="loc_us-gaap_StockholdersEquityAbstract_20b8231d-52ea-4824-a6b8-15b2dbb764d4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_44bd64a0-5316-4dc6-a652-fc1542d5006b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PreferredStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_20b8231d-52ea-4824-a6b8-15b2dbb764d4" xlink:to="loc_us-gaap_PreferredStockValue_44bd64a0-5316-4dc6-a652-fc1542d5006b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_311c8f3d-401f-4b27-940d-330c6db115ec" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_20b8231d-52ea-4824-a6b8-15b2dbb764d4" xlink:to="loc_us-gaap_CommonStockValue_311c8f3d-401f-4b27-940d-330c6db115ec" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_25a49796-a219-4e9c-b84b-5d158033fb3a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_20b8231d-52ea-4824-a6b8-15b2dbb764d4" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_25a49796-a219-4e9c-b84b-5d158033fb3a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_192d5593-cd45-41c5-aa7b-90c947d000d3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_20b8231d-52ea-4824-a6b8-15b2dbb764d4" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_192d5593-cd45-41c5-aa7b-90c947d000d3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_93d541d6-83a4-4ec1-85f8-17f67df2bfec" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_20b8231d-52ea-4824-a6b8-15b2dbb764d4" xlink:to="loc_us-gaap_StockholdersEquity_93d541d6-83a4-4ec1-85f8-17f67df2bfec" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_4520b031-64c2-49cf-858d-7a0be4078e0c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_20b8231d-52ea-4824-a6b8-15b2dbb764d4" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_4520b031-64c2-49cf-858d-7a0be4078e0c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_2f0c7cc3-4060-4b04-9763-a6f0a9d42e43" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_1e5c0da7-ab0a-4f0f-bb00-1e7482f3fc69" xlink:to="loc_us-gaap_StatementTable_2f0c7cc3-4060-4b04-9763-a6f0a9d42e43" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_dc7e42c4-c671-40bc-8d18-b3753effad32" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_2f0c7cc3-4060-4b04-9763-a6f0a9d42e43" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_dc7e42c4-c671-40bc-8d18-b3753effad32" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_dc7e42c4-c671-40bc-8d18-b3753effad32_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_dc7e42c4-c671-40bc-8d18-b3753effad32" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_dc7e42c4-c671-40bc-8d18-b3753effad32_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_68d71d07-10a5-4259-a9c8-13b8ba964850" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_dc7e42c4-c671-40bc-8d18-b3753effad32" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_68d71d07-10a5-4259-a9c8-13b8ba964850" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_TropicanaLasVegasMember_e101bc9b-2020-40f9-9d75-f3390b4ff7d6" xlink:href="glpi-20210630.xsd#glpi_TropicanaLasVegasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_68d71d07-10a5-4259-a9c8-13b8ba964850" xlink:to="loc_glpi_TropicanaLasVegasMember_e101bc9b-2020-40f9-9d75-f3390b4ff7d6" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.glpropinc.com/role/CondensedConsolidatedStatementsofIncome" xlink:type="simple" xlink:href="glpi-20210630.xsd#CondensedConsolidatedStatementsofIncome"/>
  <link:definitionLink xlink:role="http://www.glpropinc.com/role/CondensedConsolidatedStatementsofIncome" xlink:type="extended" id="i50ed58364139444ea9fc08eec64c6d79_CondensedConsolidatedStatementsofIncome">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_baac8a98-4ce7-498c-bf67-cf38753c6a34" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_1e36d78e-66c6-4210-b3b2-1ed8301a5f98" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_baac8a98-4ce7-498c-bf67-cf38753c6a34" xlink:to="loc_us-gaap_RevenuesAbstract_1e36d78e-66c6-4210-b3b2-1ed8301a5f98" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLeaseIncome_f14d0d77-54f0-4468-80d1-636e6a800742" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLeaseIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_1e36d78e-66c6-4210-b3b2-1ed8301a5f98" xlink:to="loc_us-gaap_OperatingLeaseLeaseIncome_f14d0d77-54f0-4468-80d1-636e6a800742" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeasesIncomeStatementLeaseRevenuePriortoTaxesPaidbyTenant_908218ca-d63d-46bc-ba4c-90b29db014b9" xlink:href="glpi-20210630.xsd#glpi_OperatingLeasesIncomeStatementLeaseRevenuePriortoTaxesPaidbyTenant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_1e36d78e-66c6-4210-b3b2-1ed8301a5f98" xlink:to="loc_glpi_OperatingLeasesIncomeStatementLeaseRevenuePriortoTaxesPaidbyTenant_908218ca-d63d-46bc-ba4c-90b29db014b9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndFeeIncomeLoansCommercialRealEstate_bc993ebc-46fc-4218-bab1-2eaf6732b966" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestAndFeeIncomeLoansCommercialRealEstate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_1e36d78e-66c6-4210-b3b2-1ed8301a5f98" xlink:to="loc_us-gaap_InterestAndFeeIncomeLoansCommercialRealEstate_bc993ebc-46fc-4218-bab1-2eaf6732b966" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_52e23813-288c-409f-b725-e3bc68595915" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_1e36d78e-66c6-4210-b3b2-1ed8301a5f98" xlink:to="loc_us-gaap_Revenues_52e23813-288c-409f-b725-e3bc68595915" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpensesAbstract_13eb4a40-cc6b-4573-8bb0-e4c7fac43516" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_baac8a98-4ce7-498c-bf67-cf38753c6a34" xlink:to="loc_us-gaap_OperatingExpensesAbstract_13eb4a40-cc6b-4573-8bb0-e4c7fac43516" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_11c23508-115b-473a-af00-3537b1f7e711" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_13eb4a40-cc6b-4573-8bb0-e4c7fac43516" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_11c23508-115b-473a-af00-3537b1f7e711" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_LandRightsandGroundLeaseExpense_d3d9195a-6b0c-43fd-8f32-90ad45d92c9a" xlink:href="glpi-20210630.xsd#glpi_LandRightsandGroundLeaseExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_13eb4a40-cc6b-4573-8bb0-e4c7fac43516" xlink:to="loc_glpi_LandRightsandGroundLeaseExpense_d3d9195a-6b0c-43fd-8f32-90ad45d92c9a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_9e8df71d-89b5-4812-bd9a-1648f316615e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_13eb4a40-cc6b-4573-8bb0-e4c7fac43516" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_9e8df71d-89b5-4812-bd9a-1648f316615e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets1_6aadd665-8c98-44f9-8522-8fd01cbe0b15" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainLossOnDispositionOfAssets1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_13eb4a40-cc6b-4573-8bb0-e4c7fac43516" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets1_6aadd665-8c98-44f9-8522-8fd01cbe0b15" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_e2d83856-588e-4fd2-bbe9-09a183972e89" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Depreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_13eb4a40-cc6b-4573-8bb0-e4c7fac43516" xlink:to="loc_us-gaap_Depreciation_e2d83856-588e-4fd2-bbe9-09a183972e89" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_6914e237-0374-4000-9fe1-c34aab4d25c5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_13eb4a40-cc6b-4573-8bb0-e4c7fac43516" xlink:to="loc_us-gaap_OperatingExpenses_6914e237-0374-4000-9fe1-c34aab4d25c5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_d36b400d-f4a1-4702-ae1f-5abf3d58b911" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_baac8a98-4ce7-498c-bf67-cf38753c6a34" xlink:to="loc_us-gaap_OperatingIncomeLoss_d36b400d-f4a1-4702-ae1f-5abf3d58b911" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpenseAbstract_4350f3c2-a719-4287-b51b-dd767547d68a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_baac8a98-4ce7-498c-bf67-cf38753c6a34" xlink:to="loc_us-gaap_NonoperatingIncomeExpenseAbstract_4350f3c2-a719-4287-b51b-dd767547d68a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_42d3266b-5b59-497c-b785-38479c8b6d3a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_4350f3c2-a719-4287-b51b-dd767547d68a" xlink:to="loc_us-gaap_InterestExpense_42d3266b-5b59-497c-b785-38479c8b6d3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncome_0de6a31a-33fa-460c-86ef-98b513831fb6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNonoperatingIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_4350f3c2-a719-4287-b51b-dd767547d68a" xlink:to="loc_us-gaap_OtherNonoperatingIncome_0de6a31a-33fa-460c-86ef-98b513831fb6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_94c8e2b9-c4d5-4871-b455-4b9a3bc86831" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_4350f3c2-a719-4287-b51b-dd767547d68a" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_94c8e2b9-c4d5-4871-b455-4b9a3bc86831" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_b976cfb8-ac2d-4ae4-8d2f-8d52f7b12a96" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_4350f3c2-a719-4287-b51b-dd767547d68a" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_b976cfb8-ac2d-4ae4-8d2f-8d52f7b12a96" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_105f0efc-a8b4-4ba0-af4b-f7800ad5c969" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_baac8a98-4ce7-498c-bf67-cf38753c6a34" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_105f0efc-a8b4-4ba0-af4b-f7800ad5c969" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_b0d03968-6c7b-438b-8f32-7c459389e742" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_baac8a98-4ce7-498c-bf67-cf38753c6a34" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_b0d03968-6c7b-438b-8f32-7c459389e742" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_e88320fc-0844-43e8-a7d2-6eea8ca9f531" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_baac8a98-4ce7-498c-bf67-cf38753c6a34" xlink:to="loc_us-gaap_NetIncomeLoss_e88320fc-0844-43e8-a7d2-6eea8ca9f531" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract_ef058e3c-979e-44fd-8375-663efc50406c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EarningsPerShareAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_baac8a98-4ce7-498c-bf67-cf38753c6a34" xlink:to="loc_us-gaap_EarningsPerShareAbstract_ef058e3c-979e-44fd-8375-663efc50406c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_4973f335-b702-4324-8347-28c82d012dd6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_ef058e3c-979e-44fd-8375-663efc50406c" xlink:to="loc_us-gaap_EarningsPerShareBasic_4973f335-b702-4324-8347-28c82d012dd6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_beaee460-dc7c-49c5-a6e4-588e7ace3451" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_ef058e3c-979e-44fd-8375-663efc50406c" xlink:to="loc_us-gaap_EarningsPerShareDiluted_beaee460-dc7c-49c5-a6e4-588e7ace3451" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_2b6b0448-efad-4a51-9621-48e75de496d5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_baac8a98-4ce7-498c-bf67-cf38753c6a34" xlink:to="loc_us-gaap_StatementTable_2b6b0448-efad-4a51-9621-48e75de496d5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_3de5fbf7-112e-4467-9b7f-9002dd09ef2c" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_2b6b0448-efad-4a51-9621-48e75de496d5" xlink:to="loc_srt_ProductOrServiceAxis_3de5fbf7-112e-4467-9b7f-9002dd09ef2c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_3de5fbf7-112e-4467-9b7f-9002dd09ef2c_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_3de5fbf7-112e-4467-9b7f-9002dd09ef2c" xlink:to="loc_srt_ProductsAndServicesDomain_3de5fbf7-112e-4467-9b7f-9002dd09ef2c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_3e12fba5-d0b1-4859-8d24-b1417b53ce89" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_3de5fbf7-112e-4467-9b7f-9002dd09ef2c" xlink:to="loc_srt_ProductsAndServicesDomain_3e12fba5-d0b1-4859-8d24-b1417b53ce89" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateMember_d75a0b5b-d231-4fc2-9833-c792226d8b90" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_3e12fba5-d0b1-4859-8d24-b1417b53ce89" xlink:to="loc_us-gaap_RealEstateMember_d75a0b5b-d231-4fc2-9833-c792226d8b90" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_GamingfoodbeverageandotherMember_f349ae6f-7ed5-43ac-b4d5-6c77b7ed9925" xlink:href="glpi-20210630.xsd#glpi_GamingfoodbeverageandotherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_3e12fba5-d0b1-4859-8d24-b1417b53ce89" xlink:to="loc_glpi_GamingfoodbeverageandotherMember_f349ae6f-7ed5-43ac-b4d5-6c77b7ed9925" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.glpropinc.com/role/CondensedConsolidatedStatementsofChangesinShareholdersEquityDeficit" xlink:type="simple" xlink:href="glpi-20210630.xsd#CondensedConsolidatedStatementsofChangesinShareholdersEquityDeficit"/>
  <link:definitionLink xlink:role="http://www.glpropinc.com/role/CondensedConsolidatedStatementsofChangesinShareholdersEquityDeficit" xlink:type="extended" id="i46b0fd86dce54bb898ea005da9a54209_CondensedConsolidatedStatementsofChangesinShareholdersEquityDeficit">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_b81e71a7-3a88-4ff8-9b57-561f45b6c227" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareCashPaid_b670ff6f-7fbf-4a76-aa0a-bed197615230" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockDividendsPerShareCashPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_b81e71a7-3a88-4ff8-9b57-561f45b6c227" xlink:to="loc_us-gaap_CommonStockDividendsPerShareCashPaid_b670ff6f-7fbf-4a76-aa0a-bed197615230" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_aab22cae-ee74-4584-8db0-bc8eb4f70b07" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_b81e71a7-3a88-4ff8-9b57-561f45b6c227" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_aab22cae-ee74-4584-8db0-bc8eb4f70b07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_d566b99b-bc78-4807-bf2f-7cc2543ce192" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_aab22cae-ee74-4584-8db0-bc8eb4f70b07" xlink:to="loc_us-gaap_StockholdersEquity_d566b99b-bc78-4807-bf2f-7cc2543ce192" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_723383d1-9080-46f0-94c5-c087eea6ce65" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_aab22cae-ee74-4584-8db0-bc8eb4f70b07" xlink:to="loc_us-gaap_CommonStockSharesIssued_723383d1-9080-46f0-94c5-c087eea6ce65" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_6ac14e1d-4a35-4764-8e6e-ed5b907c1cf3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_aab22cae-ee74-4584-8db0-bc8eb4f70b07" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_6ac14e1d-4a35-4764-8e6e-ed5b907c1cf3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_bd14196a-2b53-4168-954a-99637311628a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_aab22cae-ee74-4584-8db0-bc8eb4f70b07" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_bd14196a-2b53-4168-954a-99637311628a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_0b03b12a-115d-4dae-9550-ac1c63065f7d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_aab22cae-ee74-4584-8db0-bc8eb4f70b07" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_0b03b12a-115d-4dae-9550-ac1c63065f7d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_ab433a0b-f6f7-4d47-b730-13259162c717" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_aab22cae-ee74-4584-8db0-bc8eb4f70b07" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_ab433a0b-f6f7-4d47-b730-13259162c717" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockDividendsShares_0db24206-0382-4336-b445-18316920ec47" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockDividendsShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_aab22cae-ee74-4584-8db0-bc8eb4f70b07" xlink:to="loc_us-gaap_StockDividendsShares_0db24206-0382-4336-b445-18316920ec47" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Dividends_d8116ae2-25e0-4006-84be-abda183b4c24" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Dividends"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_aab22cae-ee74-4584-8db0-bc8eb4f70b07" xlink:to="loc_us-gaap_Dividends_d8116ae2-25e0-4006-84be-abda183b4c24" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_a4b85710-46cb-4fa9-8b28-bfca55d98fe5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_aab22cae-ee74-4584-8db0-bc8eb4f70b07" xlink:to="loc_us-gaap_NetIncomeLoss_a4b85710-46cb-4fa9-8b28-bfca55d98fe5" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_596fca98-fad7-4184-8f15-6a41ecd38d0f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_1668a8ae-019f-4333-9402-e600108bbd1f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_0e7c8819-5b76-4e07-8b7a-c89372206427" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_b81e71a7-3a88-4ff8-9b57-561f45b6c227" xlink:to="loc_us-gaap_StatementTable_0e7c8819-5b76-4e07-8b7a-c89372206427" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_0cd812c5-a4e2-4566-a958-094708b4fcef" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_0e7c8819-5b76-4e07-8b7a-c89372206427" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_0cd812c5-a4e2-4566-a958-094708b4fcef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_0cd812c5-a4e2-4566-a958-094708b4fcef_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_0cd812c5-a4e2-4566-a958-094708b4fcef" xlink:to="loc_us-gaap_EquityComponentDomain_0cd812c5-a4e2-4566-a958-094708b4fcef_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_d7eb2126-8e1f-4247-bf94-7e44857768a4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_0cd812c5-a4e2-4566-a958-094708b4fcef" xlink:to="loc_us-gaap_EquityComponentDomain_d7eb2126-8e1f-4247-bf94-7e44857768a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_97197ffd-3e63-4d77-8472-f01e6c0f969d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_d7eb2126-8e1f-4247-bf94-7e44857768a4" xlink:to="loc_us-gaap_CommonStockMember_97197ffd-3e63-4d77-8472-f01e6c0f969d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_08da737d-3abd-4cd9-92ec-176a28909247" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_d7eb2126-8e1f-4247-bf94-7e44857768a4" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_08da737d-3abd-4cd9-92ec-176a28909247" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_49d3c1cd-8e8f-4943-9c44-6e999e9ebd69" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_d7eb2126-8e1f-4247-bf94-7e44857768a4" xlink:to="loc_us-gaap_RetainedEarningsMember_49d3c1cd-8e8f-4943-9c44-6e999e9ebd69" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.glpropinc.com/role/BusinessandOperationsDetails" xlink:type="simple" xlink:href="glpi-20210630.xsd#BusinessandOperationsDetails"/>
  <link:definitionLink xlink:role="http://www.glpropinc.com/role/BusinessandOperationsDetails" xlink:type="extended" id="ica013edbaddd4ca09d5d2c3befe6aab2_BusinessandOperationsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:href="glpi-20210630.xsd#glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeaseTermOfContract_3f3a762a-ad5b-4b23-a638-b06f70b43295" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LessorOperatingLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_us-gaap_LessorOperatingLeaseTermOfContract_3f3a762a-ad5b-4b23-a638-b06f70b43295" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_LessorLeasingArrangementsOperatingLeasesNumberOfRenewalOptions_e914515c-9db3-4608-8961-0c5462881e3e" xlink:href="glpi-20210630.xsd#glpi_LessorLeasingArrangementsOperatingLeasesNumberOfRenewalOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_glpi_LessorLeasingArrangementsOperatingLeasesNumberOfRenewalOptions_e914515c-9db3-4608-8961-0c5462881e3e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeaseRenewalTerm_70ce4da2-a79e-4f43-a3df-a8515b73f1e8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LessorOperatingLeaseRenewalTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_us-gaap_LessorOperatingLeaseRenewalTerm_70ce4da2-a79e-4f43-a3df-a8515b73f1e8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_AssetConsiderationTransferred_ee0e4506-ecb9-4531-b87e-b34bec7d150a" xlink:href="glpi-20210630.xsd#glpi_AssetConsiderationTransferred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_glpi_AssetConsiderationTransferred_ee0e4506-ecb9-4531-b87e-b34bec7d150a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_PaymentstoAcquireRealEstateExcludingTransactionCosts_ef9ea6e9-c28b-4d19-9122-5bcd953e4be9" xlink:href="glpi-20210630.xsd#glpi_PaymentstoAcquireRealEstateExcludingTransactionCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_glpi_PaymentstoAcquireRealEstateExcludingTransactionCosts_ef9ea6e9-c28b-4d19-9122-5bcd953e4be9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireFinanceReceivables_7dc5c9f1-d7f6-4544-9659-f75cc3eadbc9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireFinanceReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_us-gaap_PaymentsToAcquireFinanceReceivables_7dc5c9f1-d7f6-4544-9659-f75cc3eadbc9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_NumberOfFacilitiesWhoseRealEstatePropertyIsIncludedInEntityPortfolio_6bf55f5b-3718-4f69-a52d-bcb7b497b66f" xlink:href="glpi-20210630.xsd#glpi_NumberOfFacilitiesWhoseRealEstatePropertyIsIncludedInEntityPortfolio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_glpi_NumberOfFacilitiesWhoseRealEstatePropertyIsIncludedInEntityPortfolio_6bf55f5b-3718-4f69-a52d-bcb7b497b66f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfRealEstateProperties_f14a5019-7c37-4ede-ba84-0d83b958ea08" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NumberOfRealEstateProperties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_us-gaap_NumberOfRealEstateProperties_f14a5019-7c37-4ede-ba84-0d83b958ea08" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfStatesInWhichEntityOperates_bfbee493-bae2-4ad2-987e-2ba5097cdd61" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NumberOfStatesInWhichEntityOperates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_us-gaap_NumberOfStatesInWhichEntityOperates_bfbee493-bae2-4ad2-987e-2ba5097cdd61" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_Realestateoccupancypercentage_f6040fae-953d-47c5-96a7-01697a61daa8" xlink:href="glpi-20210630.xsd#glpi_Realestateoccupancypercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_glpi_Realestateoccupancypercentage_f6040fae-953d-47c5-96a7-01697a61daa8" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AreaOfRealEstateProperty_98fe17b5-f2c8-4eda-8e95-b62e84893b5b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AreaOfRealEstateProperty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_us-gaap_AreaOfRealEstateProperty_98fe17b5-f2c8-4eda-8e95-b62e84893b5b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_Operatingleasesfrequencythepropertyperformancebasedrentstructureisadjusted_e43d40d9-05b4-4383-a32c-7792fd98f15b" xlink:href="glpi-20210630.xsd#glpi_Operatingleasesfrequencythepropertyperformancebasedrentstructureisadjusted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_glpi_Operatingleasesfrequencythepropertyperformancebasedrentstructureisadjusted_e43d40d9-05b4-4383-a32c-7792fd98f15b" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_Operatingleasespercentoftheaveragenetrevenuesofpropertysusedtocalculaterentincrease_e7891c6e-e1e5-4acd-8714-2116c304f26f" xlink:href="glpi-20210630.xsd#glpi_Operatingleasespercentoftheaveragenetrevenuesofpropertysusedtocalculaterentincrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_glpi_Operatingleasespercentoftheaveragenetrevenuesofpropertysusedtocalculaterentincrease_e7891c6e-e1e5-4acd-8714-2116c304f26f" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_Operatingleasesannualrentalescalationpercentage_db1aebb3-9a3d-4d0c-91a0-bf8eef235edf" xlink:href="glpi-20210630.xsd#glpi_Operatingleasesannualrentalescalationpercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_glpi_Operatingleasesannualrentalescalationpercentage_db1aebb3-9a3d-4d0c-91a0-bf8eef235edf" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeasesAnnualRentEscalatorOveraPeriodofTimeContingentUpontheAchievementofCertainRentCoverageRatioThresholdPercentage_ef3d81f6-8331-4120-b4ef-408e8225c4ea" xlink:href="glpi-20210630.xsd#glpi_OperatingLeasesAnnualRentEscalatorOveraPeriodofTimeContingentUpontheAchievementofCertainRentCoverageRatioThresholdPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_glpi_OperatingLeasesAnnualRentEscalatorOveraPeriodofTimeContingentUpontheAchievementofCertainRentCoverageRatioThresholdPercentage_ef3d81f6-8331-4120-b4ef-408e8225c4ea" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeasesPeriodExistingUponTriggeringAnnualRentEscalatorReset_fe617e53-9796-4cb8-a491-3c74052fa4a0" xlink:href="glpi-20210630.xsd#glpi_OperatingLeasesPeriodExistingUponTriggeringAnnualRentEscalatorReset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_glpi_OperatingLeasesPeriodExistingUponTriggeringAnnualRentEscalatorReset_fe617e53-9796-4cb8-a491-3c74052fa4a0" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeasesAmountofRentAvailableUponTriggeringAnnualRentEscalatorReset_d7c577fd-0c54-4864-b2aa-ae9bc4e46482" xlink:href="glpi-20210630.xsd#glpi_OperatingLeasesAmountofRentAvailableUponTriggeringAnnualRentEscalatorReset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_glpi_OperatingLeasesAmountofRentAvailableUponTriggeringAnnualRentEscalatorReset_d7c577fd-0c54-4864-b2aa-ae9bc4e46482" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeasesPercentagetoWhichRentEscalationWillbeReducedUponAchievementofCertainThreshold_ed596d2a-cdd9-46cc-8f71-1a1e4bb6e77f" xlink:href="glpi-20210630.xsd#glpi_OperatingLeasesPercentagetoWhichRentEscalationWillbeReducedUponAchievementofCertainThreshold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_glpi_OperatingLeasesPercentagetoWhichRentEscalationWillbeReducedUponAchievementofCertainThreshold_ed596d2a-cdd9-46cc-8f71-1a1e4bb6e77f" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeaseCashRentReceived_a0cd72fe-4160-4c60-8141-5db4aa1961eb" xlink:href="glpi-20210630.xsd#glpi_OperatingLeaseCashRentReceived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_glpi_OperatingLeaseCashRentReceived_a0cd72fe-4160-4c60-8141-5db4aa1961eb" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeaseRentEscalatorYear5AndYear6_61333b7b-046b-4949-b284-ba49a45ccfe8" xlink:href="glpi-20210630.xsd#glpi_OperatingLeaseRentEscalatorYear5AndYear6"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_glpi_OperatingLeaseRentEscalatorYear5AndYear6_61333b7b-046b-4949-b284-ba49a45ccfe8" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeaseRentEscalatorYear7AndYear8_31bdd736-32a9-4887-9bde-97370d575f74" xlink:href="glpi-20210630.xsd#glpi_OperatingLeaseRentEscalatorYear7AndYear8"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_glpi_OperatingLeaseRentEscalatorYear7AndYear8_31bdd736-32a9-4887-9bde-97370d575f74" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeaseRentEscalatorAfterYear9_b4b5b141-2945-4aa2-8db1-ea414066a7a7" xlink:href="glpi-20210630.xsd#glpi_OperatingLeaseRentEscalatorAfterYear9"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_glpi_OperatingLeaseRentEscalatorAfterYear9_b4b5b141-2945-4aa2-8db1-ea414066a7a7" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireProductiveAssets_1a16b8aa-53b1-4819-98c8-2d77d9ed41d0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireProductiveAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_us-gaap_PaymentsToAcquireProductiveAssets_1a16b8aa-53b1-4819-98c8-2d77d9ed41d0" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_NoncashOrPartNoncashAcquisitionGainLossOnAssetsAcquired_05432d98-f775-4bd1-acae-06246e48df52" xlink:href="glpi-20210630.xsd#glpi_NoncashOrPartNoncashAcquisitionGainLossOnAssetsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_glpi_NoncashOrPartNoncashAcquisitionGainLossOnAssetsAcquired_05432d98-f775-4bd1-acae-06246e48df52" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_94d0c8e0-83fc-437a-b6df-42ab565468bf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_94d0c8e0-83fc-437a-b6df-42ab565468bf" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_AssetAcquisitionRentCreditsTransferred_4e1bbfd3-4735-4a6b-bc64-b0ee67756743" xlink:href="glpi-20210630.xsd#glpi_AssetAcquisitionRentCreditsTransferred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_glpi_AssetAcquisitionRentCreditsTransferred_4e1bbfd3-4735-4a6b-bc64-b0ee67756743" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsTable_4cfd07c6-4de9-48b1-8025-ba191fb3f630" xlink:href="glpi-20210630.xsd#glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_c16dba34-d455-4840-bb63-02c22a492547" xlink:to="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsTable_4cfd07c6-4de9-48b1-8025-ba191fb3f630" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_038474e1-a97d-4d78-98c1-25f6ce12922f" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsTable_4cfd07c6-4de9-48b1-8025-ba191fb3f630" xlink:to="loc_srt_CounterpartyNameAxis_038474e1-a97d-4d78-98c1-25f6ce12922f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_038474e1-a97d-4d78-98c1-25f6ce12922f_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_038474e1-a97d-4d78-98c1-25f6ce12922f" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_038474e1-a97d-4d78-98c1-25f6ce12922f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_5d8f7e9a-9b71-4407-9dc8-339eb65b9c63" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_038474e1-a97d-4d78-98c1-25f6ce12922f" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_5d8f7e9a-9b71-4407-9dc8-339eb65b9c63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_EldoradoResortsInc.Member_30d07542-3864-479c-b01a-e37093f594d5" xlink:href="glpi-20210630.xsd#glpi_EldoradoResortsInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_5d8f7e9a-9b71-4407-9dc8-339eb65b9c63" xlink:to="loc_glpi_EldoradoResortsInc.Member_30d07542-3864-479c-b01a-e37093f594d5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_BoydGamingCorporationMember_cc9877d4-478e-4f52-9872-349b59f5d8a5" xlink:href="glpi-20210630.xsd#glpi_BoydGamingCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_5d8f7e9a-9b71-4407-9dc8-339eb65b9c63" xlink:to="loc_glpi_BoydGamingCorporationMember_cc9877d4-478e-4f52-9872-349b59f5d8a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_e47b98e1-c0dd-478d-8c1f-bf7a4132bca2" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsTable_4cfd07c6-4de9-48b1-8025-ba191fb3f630" xlink:to="loc_srt_MajorCustomersAxis_e47b98e1-c0dd-478d-8c1f-bf7a4132bca2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_e47b98e1-c0dd-478d-8c1f-bf7a4132bca2_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_e47b98e1-c0dd-478d-8c1f-bf7a4132bca2" xlink:to="loc_srt_NameOfMajorCustomerDomain_e47b98e1-c0dd-478d-8c1f-bf7a4132bca2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_479e584f-1dfd-413d-b8dc-e683395cc8fc" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_e47b98e1-c0dd-478d-8c1f-bf7a4132bca2" xlink:to="loc_srt_NameOfMajorCustomerDomain_479e584f-1dfd-413d-b8dc-e683395cc8fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_EldoradoResortsInc.Member_6813e9ee-ab9c-4c42-a11c-e43eb58ccf8d" xlink:href="glpi-20210630.xsd#glpi_EldoradoResortsInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_479e584f-1dfd-413d-b8dc-e683395cc8fc" xlink:to="loc_glpi_EldoradoResortsInc.Member_6813e9ee-ab9c-4c42-a11c-e43eb58ccf8d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_BoydGamingCorporationMember_1b1e1165-5aa4-45b6-b238-e93dd05ce6e6" xlink:href="glpi-20210630.xsd#glpi_BoydGamingCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_479e584f-1dfd-413d-b8dc-e683395cc8fc" xlink:to="loc_glpi_BoydGamingCorporationMember_1b1e1165-5aa4-45b6-b238-e93dd05ce6e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_PennNationalGamingIncMember_d5ce319b-2c77-4813-b282-1b8b29afaac4" xlink:href="glpi-20210630.xsd#glpi_PennNationalGamingIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_479e584f-1dfd-413d-b8dc-e683395cc8fc" xlink:to="loc_glpi_PennNationalGamingIncMember_d5ce319b-2c77-4813-b282-1b8b29afaac4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_2f1e928e-5b1e-4b5c-ba67-c4f6b2eaf032" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsTable_4cfd07c6-4de9-48b1-8025-ba191fb3f630" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_2f1e928e-5b1e-4b5c-ba67-c4f6b2eaf032" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_2f1e928e-5b1e-4b5c-ba67-c4f6b2eaf032_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_2f1e928e-5b1e-4b5c-ba67-c4f6b2eaf032" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_2f1e928e-5b1e-4b5c-ba67-c4f6b2eaf032_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_c1d117a7-2e8e-4256-9e40-147d5e5ed093" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_2f1e928e-5b1e-4b5c-ba67-c4f6b2eaf032" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_c1d117a7-2e8e-4256-9e40-147d5e5ed093" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateLoanMember_ad0cd50a-dba3-41b1-8176-63d79711e678" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_c1d117a7-2e8e-4256-9e40-147d5e5ed093" xlink:to="loc_us-gaap_RealEstateLoanMember_ad0cd50a-dba3-41b1-8176-63d79711e678" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_6ae1c83d-9bbd-441e-bdca-16f6560b5637" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsTable_4cfd07c6-4de9-48b1-8025-ba191fb3f630" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_6ae1c83d-9bbd-441e-bdca-16f6560b5637" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6ae1c83d-9bbd-441e-bdca-16f6560b5637_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_6ae1c83d-9bbd-441e-bdca-16f6560b5637" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6ae1c83d-9bbd-441e-bdca-16f6560b5637_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_908c55f2-426b-4042-9256-167443d4eb4e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_6ae1c83d-9bbd-441e-bdca-16f6560b5637" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_908c55f2-426b-4042-9256-167443d4eb4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_PinnacleEntertainmentInc.Member_25d4d72f-b1d3-44b9-a0b1-bad7eb41bac8" xlink:href="glpi-20210630.xsd#glpi_PinnacleEntertainmentInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_908c55f2-426b-4042-9256-167443d4eb4e" xlink:to="loc_glpi_PinnacleEntertainmentInc.Member_25d4d72f-b1d3-44b9-a0b1-bad7eb41bac8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_PlainridgeParkCasinoMember_7dd7f19a-b842-4858-bd2a-b12316be035e" xlink:href="glpi-20210630.xsd#glpi_PlainridgeParkCasinoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_908c55f2-426b-4042-9256-167443d4eb4e" xlink:to="loc_glpi_PlainridgeParkCasinoMember_7dd7f19a-b842-4858-bd2a-b12316be035e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_TropicanaEntertainmentMember_acf90685-79a2-4b5a-b414-46046e09d206" xlink:href="glpi-20210630.xsd#glpi_TropicanaEntertainmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_908c55f2-426b-4042-9256-167443d4eb4e" xlink:to="loc_glpi_TropicanaEntertainmentMember_acf90685-79a2-4b5a-b414-46046e09d206" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_BallysTropicanaEvansvilleMember_aeeb2d06-5bf5-49ea-bf52-85e7b7d925ca" xlink:href="glpi-20210630.xsd#glpi_BallysTropicanaEvansvilleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_908c55f2-426b-4042-9256-167443d4eb4e" xlink:to="loc_glpi_BallysTropicanaEvansvilleMember_aeeb2d06-5bf5-49ea-bf52-85e7b7d925ca" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_DoverDownsHotelCasinoMember_bf8f0d55-b361-4e89-acf1-331e7366589e" xlink:href="glpi-20210630.xsd#glpi_DoverDownsHotelCasinoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_908c55f2-426b-4042-9256-167443d4eb4e" xlink:to="loc_glpi_DoverDownsHotelCasinoMember_bf8f0d55-b361-4e89-acf1-331e7366589e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermAxis_ba7a9258-3d32-4630-8f91-4aef5c4e4096" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseContractualTermAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsTable_4cfd07c6-4de9-48b1-8025-ba191fb3f630" xlink:to="loc_us-gaap_LeaseContractualTermAxis_ba7a9258-3d32-4630-8f91-4aef5c4e4096" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_ba7a9258-3d32-4630-8f91-4aef5c4e4096_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LeaseContractualTermAxis_ba7a9258-3d32-4630-8f91-4aef5c4e4096" xlink:to="loc_us-gaap_LeaseContractualTermDomain_ba7a9258-3d32-4630-8f91-4aef5c4e4096_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_c55eec1a-90ba-439b-9671-7cc12aa4d915" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LeaseContractualTermAxis_ba7a9258-3d32-4630-8f91-4aef5c4e4096" xlink:to="loc_us-gaap_LeaseContractualTermDomain_c55eec1a-90ba-439b-9671-7cc12aa4d915" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_AmendedPinnacleEntertainmentInc.MasterLeaseMember_83020f2c-93d5-4abf-8247-f3ab4e48ef93" xlink:href="glpi-20210630.xsd#glpi_AmendedPinnacleEntertainmentInc.MasterLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_c55eec1a-90ba-439b-9671-7cc12aa4d915" xlink:to="loc_glpi_AmendedPinnacleEntertainmentInc.MasterLeaseMember_83020f2c-93d5-4abf-8247-f3ab4e48ef93" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_BoydGamingCorporationMasterLeaseMember_9e7ef7fc-b851-4f80-8053-cbde5b0b2443" xlink:href="glpi-20210630.xsd#glpi_BoydGamingCorporationMasterLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_c55eec1a-90ba-439b-9671-7cc12aa4d915" xlink:to="loc_glpi_BoydGamingCorporationMasterLeaseMember_9e7ef7fc-b851-4f80-8053-cbde5b0b2443" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_PennNationalGamingInc.MeadowsLeaseMember_e978bb01-20ef-4992-b96c-de062a999ba2" xlink:href="glpi-20210630.xsd#glpi_PennNationalGamingInc.MeadowsLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_c55eec1a-90ba-439b-9671-7cc12aa4d915" xlink:to="loc_glpi_PennNationalGamingInc.MeadowsLeaseMember_e978bb01-20ef-4992-b96c-de062a999ba2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_CaesarsMasterLeaseMember_cdded809-5265-4a7c-96d5-9348fe55b4dd" xlink:href="glpi-20210630.xsd#glpi_CaesarsMasterLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_c55eec1a-90ba-439b-9671-7cc12aa4d915" xlink:to="loc_glpi_CaesarsMasterLeaseMember_cdded809-5265-4a7c-96d5-9348fe55b4dd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_AmendedAndRestatedCaesarsMasterLeaseMember_171f4594-3359-4504-85cb-9bbc958a1186" xlink:href="glpi-20210630.xsd#glpi_AmendedAndRestatedCaesarsMasterLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_c55eec1a-90ba-439b-9671-7cc12aa4d915" xlink:to="loc_glpi_AmendedAndRestatedCaesarsMasterLeaseMember_171f4594-3359-4504-85cb-9bbc958a1186" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_LumirePlaceLeaseMember_aa9d8aed-3cd8-48b9-9d88-d2af5d4b568d" xlink:href="glpi-20210630.xsd#glpi_LumirePlaceLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_c55eec1a-90ba-439b-9671-7cc12aa4d915" xlink:to="loc_glpi_LumirePlaceLeaseMember_aa9d8aed-3cd8-48b9-9d88-d2af5d4b568d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_MorgantownLeaseMember_53b77ea8-5a5f-4804-ae7c-e2a67226e2b4" xlink:href="glpi-20210630.xsd#glpi_MorgantownLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_c55eec1a-90ba-439b-9671-7cc12aa4d915" xlink:to="loc_glpi_MorgantownLeaseMember_53b77ea8-5a5f-4804-ae7c-e2a67226e2b4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_BallysMasterLeaseMember_3e8f0f13-3aad-41e8-a8a4-2c093cfff86a" xlink:href="glpi-20210630.xsd#glpi_BallysMasterLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_c55eec1a-90ba-439b-9671-7cc12aa4d915" xlink:to="loc_glpi_BallysMasterLeaseMember_3e8f0f13-3aad-41e8-a8a4-2c093cfff86a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_979ec489-fbf1-4943-b2db-060519c195dc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_glpi_OrganizationConsolidationAndPresentationOfFinancialStatementsTable_4cfd07c6-4de9-48b1-8025-ba191fb3f630" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_979ec489-fbf1-4943-b2db-060519c195dc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_979ec489-fbf1-4943-b2db-060519c195dc_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_979ec489-fbf1-4943-b2db-060519c195dc" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_979ec489-fbf1-4943-b2db-060519c195dc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_56936712-c18b-4119-adc8-707288c2eb33" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_979ec489-fbf1-4943-b2db-060519c195dc" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_56936712-c18b-4119-adc8-707288c2eb33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandMember_b28ad237-e174-4bf9-8ccb-aff45d393e6a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_56936712-c18b-4119-adc8-707288c2eb33" xlink:to="loc_us-gaap_LandMember_b28ad237-e174-4bf9-8ccb-aff45d393e6a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_ad8c7499-505a-49bd-9161-bc8c8a929edd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_56936712-c18b-4119-adc8-707288c2eb33" xlink:to="loc_us-gaap_BuildingMember_ad8c7499-505a-49bd-9161-bc8c8a929edd" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.glpropinc.com/role/RealEstateInvestmentsDetails" xlink:type="simple" xlink:href="glpi-20210630.xsd#RealEstateInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://www.glpropinc.com/role/RealEstateInvestmentsDetails" xlink:type="extended" id="i0717d5281b584ad188e5f19d15e15f81_RealEstateInvestmentsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstatePropertiesLineItems_06852b08-ea01-41cd-a980-783b6931bb20" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstatePropertiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfRealEstateProperties_39d79de1-7318-435d-bb5b-d67be13c323b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NumberOfRealEstateProperties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RealEstatePropertiesLineItems_06852b08-ea01-41cd-a980-783b6931bb20" xlink:to="loc_us-gaap_NumberOfRealEstateProperties_39d79de1-7318-435d-bb5b-d67be13c323b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateInvestmentPropertyAtCost_2884dd3b-2213-4951-b5d1-ead79d2c4549" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateInvestmentPropertyAtCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RealEstatePropertiesLineItems_06852b08-ea01-41cd-a980-783b6931bb20" xlink:to="loc_us-gaap_RealEstateInvestmentPropertyAtCost_2884dd3b-2213-4951-b5d1-ead79d2c4549" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation_37dbaf38-ffc5-43c9-9c35-98838bb5ed4a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RealEstatePropertiesLineItems_06852b08-ea01-41cd-a980-783b6931bb20" xlink:to="loc_us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation_37dbaf38-ffc5-43c9-9c35-98838bb5ed4a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateInvestmentPropertyNet_4c2ae83b-1236-4324-bd95-f25246fc777a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateInvestmentPropertyNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RealEstatePropertiesLineItems_06852b08-ea01-41cd-a980-783b6931bb20" xlink:to="loc_us-gaap_RealEstateInvestmentPropertyNet_4c2ae83b-1236-4324-bd95-f25246fc777a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRealEstatePropertiesTable_c91f7d6d-9f0f-41e4-9664-7e39bd7b9d1e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfRealEstatePropertiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RealEstatePropertiesLineItems_06852b08-ea01-41cd-a980-783b6931bb20" xlink:to="loc_us-gaap_ScheduleOfRealEstatePropertiesTable_c91f7d6d-9f0f-41e4-9664-7e39bd7b9d1e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_6f717ed5-46fd-472c-8a92-b577354a9418" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRealEstatePropertiesTable_c91f7d6d-9f0f-41e4-9664-7e39bd7b9d1e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_6f717ed5-46fd-472c-8a92-b577354a9418" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6f717ed5-46fd-472c-8a92-b577354a9418_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_6f717ed5-46fd-472c-8a92-b577354a9418" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6f717ed5-46fd-472c-8a92-b577354a9418_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_2d649a9c-b7f7-4e99-929c-6e231e83cfd7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_6f717ed5-46fd-472c-8a92-b577354a9418" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_2d649a9c-b7f7-4e99-929c-6e231e83cfd7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandAndLandImprovementsMember_79b902ea-bf93-49c9-be96-f8d5a562edf1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LandAndLandImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_2d649a9c-b7f7-4e99-929c-6e231e83cfd7" xlink:to="loc_us-gaap_LandAndLandImprovementsMember_79b902ea-bf93-49c9-be96-f8d5a562edf1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingAndBuildingImprovementsMember_80bdbe7d-0d21-4e38-8fe0-c44f45fa1ddf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BuildingAndBuildingImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_2d649a9c-b7f7-4e99-929c-6e231e83cfd7" xlink:to="loc_us-gaap_BuildingAndBuildingImprovementsMember_80bdbe7d-0d21-4e38-8fe0-c44f45fa1ddf" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.glpropinc.com/role/PropertyandEquipmentUsedinOperationsDetails" xlink:type="simple" xlink:href="glpi-20210630.xsd#PropertyandEquipmentUsedinOperationsDetails"/>
  <link:definitionLink xlink:role="http://www.glpropinc.com/role/PropertyandEquipmentUsedinOperationsDetails" xlink:type="extended" id="ic1e8132e5cb5419296d98fd7b24bf17c_PropertyandEquipmentUsedinOperationsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_1cea94fa-f010-4167-abee-4105400bb372" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_3352e496-8f60-4701-be3f-3b30a320945b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_1cea94fa-f010-4167-abee-4105400bb372" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_3352e496-8f60-4701-be3f-3b30a320945b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_e1522a7d-3300-4c56-a99f-b11a4f5c11b7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_1cea94fa-f010-4167-abee-4105400bb372" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_e1522a7d-3300-4c56-a99f-b11a4f5c11b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_fc452eda-77cb-4374-99d7-5fc74e48d98e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_1cea94fa-f010-4167-abee-4105400bb372" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_fc452eda-77cb-4374-99d7-5fc74e48d98e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_d5806b7a-082a-4bd2-8c88-8054abfcebca" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_1cea94fa-f010-4167-abee-4105400bb372" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_d5806b7a-082a-4bd2-8c88-8054abfcebca" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_462f70bc-3b3a-4052-aa13-d8a11966af5f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_d5806b7a-082a-4bd2-8c88-8054abfcebca" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_462f70bc-3b3a-4052-aa13-d8a11966af5f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_462f70bc-3b3a-4052-aa13-d8a11966af5f_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_462f70bc-3b3a-4052-aa13-d8a11966af5f" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_462f70bc-3b3a-4052-aa13-d8a11966af5f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_92e30392-ecf9-4995-ad63-1636fdcc4455" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_462f70bc-3b3a-4052-aa13-d8a11966af5f" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_92e30392-ecf9-4995-ad63-1636fdcc4455" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandAndLandImprovementsMember_eca92b5b-6e06-4b0d-9758-c1e2015492dc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LandAndLandImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_92e30392-ecf9-4995-ad63-1636fdcc4455" xlink:to="loc_us-gaap_LandAndLandImprovementsMember_eca92b5b-6e06-4b0d-9758-c1e2015492dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingAndBuildingImprovementsMember_ce147949-cb60-4de0-9639-76c804456c0f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BuildingAndBuildingImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_92e30392-ecf9-4995-ad63-1636fdcc4455" xlink:to="loc_us-gaap_BuildingAndBuildingImprovementsMember_ce147949-cb60-4de0-9639-76c804456c0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_ce5d7ac6-ef74-43aa-b45d-171441c7af93" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FurnitureAndFixturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_92e30392-ecf9-4995-ad63-1636fdcc4455" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_ce5d7ac6-ef74-43aa-b45d-171441c7af93" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressMember_09fc7a0f-3677-490d-8422-1e6f1cf5e4bf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConstructionInProgressMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_92e30392-ecf9-4995-ad63-1636fdcc4455" xlink:to="loc_us-gaap_ConstructionInProgressMember_09fc7a0f-3677-490d-8422-1e6f1cf5e4bf" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.glpropinc.com/role/AssetsHeldforSaleDetails" xlink:type="simple" xlink:href="glpi-20210630.xsd#AssetsHeldforSaleDetails"/>
  <link:definitionLink xlink:role="http://www.glpropinc.com/role/AssetsHeldforSaleDetails" xlink:type="extended" id="i1bb7146a4bbe451392f779ac9106b726_AssetsHeldforSaleDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_261ff01a-e300-4488-8da4-432264580863" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongLivedAssetsHeldForSaleLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_SalesLeasebackTransactionConsiderationAmount_197626d7-3a11-4bf2-a673-1ccafa639bf4" xlink:href="glpi-20210630.xsd#glpi_SalesLeasebackTransactionConsiderationAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_261ff01a-e300-4488-8da4-432264580863" xlink:to="loc_glpi_SalesLeasebackTransactionConsiderationAmount_197626d7-3a11-4bf2-a673-1ccafa639bf4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_SalesLeasebackTransactionAnnualRentRetained_8a896ef2-2e5b-4b7e-aca0-2d49f250e269" xlink:href="glpi-20210630.xsd#glpi_SalesLeasebackTransactionAnnualRentRetained"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_261ff01a-e300-4488-8da4-432264580863" xlink:to="loc_glpi_SalesLeasebackTransactionAnnualRentRetained_8a896ef2-2e5b-4b7e-aca0-2d49f250e269" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeaseTermOfContract_b3138875-1efe-4c58-b9c5-c749d6cda963" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LessorOperatingLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_261ff01a-e300-4488-8da4-432264580863" xlink:to="loc_us-gaap_LessorOperatingLeaseTermOfContract_b3138875-1efe-4c58-b9c5-c749d6cda963" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_LessorLeasingArrangementsOperatingLeasesNumberOfRenewalOptions_206243cb-7f54-4e88-923b-a66933e586e8" xlink:href="glpi-20210630.xsd#glpi_LessorLeasingArrangementsOperatingLeasesNumberOfRenewalOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_261ff01a-e300-4488-8da4-432264580863" xlink:to="loc_glpi_LessorLeasingArrangementsOperatingLeasesNumberOfRenewalOptions_206243cb-7f54-4e88-923b-a66933e586e8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseRenewalTerm_90b052a8-5b0b-45c8-b9c8-0adac12c5a43" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseRenewalTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_261ff01a-e300-4488-8da4-432264580863" xlink:to="loc_us-gaap_LesseeOperatingLeaseRenewalTerm_90b052a8-5b0b-45c8-b9c8-0adac12c5a43" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_SalesLeasebackTransactionYield_f068a683-6199-4238-bbad-b90acee97143" xlink:href="glpi-20210630.xsd#glpi_SalesLeasebackTransactionYield"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_261ff01a-e300-4488-8da4-432264580863" xlink:to="loc_glpi_SalesLeasebackTransactionYield_f068a683-6199-4238-bbad-b90acee97143" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_dcd0e144-ccd4-4493-9651-727466878f94" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_261ff01a-e300-4488-8da4-432264580863" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_dcd0e144-ccd4-4493-9651-727466878f94" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable_8d5c18d5-0516-4b20-aa9c-d151c260c1dd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_261ff01a-e300-4488-8da4-432264580863" xlink:to="loc_us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable_8d5c18d5-0516-4b20-aa9c-d151c260c1dd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_f09e9a07-02c9-497c-9d16-4b64e70d1c5c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable_8d5c18d5-0516-4b20-aa9c-d151c260c1dd" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_f09e9a07-02c9-497c-9d16-4b64e70d1c5c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f09e9a07-02c9-497c-9d16-4b64e70d1c5c_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_f09e9a07-02c9-497c-9d16-4b64e70d1c5c" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f09e9a07-02c9-497c-9d16-4b64e70d1c5c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_116d71d8-18bb-4d3d-9337-e0437658e87b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_f09e9a07-02c9-497c-9d16-4b64e70d1c5c" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_116d71d8-18bb-4d3d-9337-e0437658e87b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_TropicanaLasVegasMember_281c9ca7-44b7-4674-9d5e-550f3a9a5a66" xlink:href="glpi-20210630.xsd#glpi_TropicanaLasVegasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_116d71d8-18bb-4d3d-9337-e0437658e87b" xlink:to="loc_glpi_TropicanaLasVegasMember_281c9ca7-44b7-4674-9d5e-550f3a9a5a66" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermAxis_09300dd3-ca48-48f6-ade9-c7478c91ad51" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseContractualTermAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable_8d5c18d5-0516-4b20-aa9c-d151c260c1dd" xlink:to="loc_us-gaap_LeaseContractualTermAxis_09300dd3-ca48-48f6-ade9-c7478c91ad51" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_09300dd3-ca48-48f6-ade9-c7478c91ad51_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LeaseContractualTermAxis_09300dd3-ca48-48f6-ade9-c7478c91ad51" xlink:to="loc_us-gaap_LeaseContractualTermDomain_09300dd3-ca48-48f6-ade9-c7478c91ad51_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_95bcfd49-96fa-41ee-9775-f93c071dae04" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LeaseContractualTermAxis_09300dd3-ca48-48f6-ade9-c7478c91ad51" xlink:to="loc_us-gaap_LeaseContractualTermDomain_95bcfd49-96fa-41ee-9775-f93c071dae04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_CasinoQueenLeaseMember_51f1a822-391a-40db-900f-9a26d37c4145" xlink:href="glpi-20210630.xsd#glpi_CasinoQueenLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_95bcfd49-96fa-41ee-9775-f93c071dae04" xlink:to="loc_glpi_CasinoQueenLeaseMember_51f1a822-391a-40db-900f-9a26d37c4145" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_HollywoodCasinoPerryvilleMDMember_e035f915-a977-4727-897c-97008bc84119" xlink:href="glpi-20210630.xsd#glpi_HollywoodCasinoPerryvilleMDMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_95bcfd49-96fa-41ee-9775-f93c071dae04" xlink:to="loc_glpi_HollywoodCasinoPerryvilleMDMember_e035f915-a977-4727-897c-97008bc84119" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.glpropinc.com/role/AssetsHeldforSaleScheduleofAssetsHeldforSaleDetails" xlink:type="simple" xlink:href="glpi-20210630.xsd#AssetsHeldforSaleScheduleofAssetsHeldforSaleDetails"/>
  <link:definitionLink xlink:role="http://www.glpropinc.com/role/AssetsHeldforSaleScheduleofAssetsHeldforSaleDetails" xlink:type="extended" id="ie94c6953d814469683ed94bb0b64fb5c_AssetsHeldforSaleScheduleofAssetsHeldforSaleDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_9bbe0e28-a920-4325-bc68-de16b46c26e5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongLivedAssetsHeldForSaleLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_6bb6851c-0a5b-4f8a-9bdc-d0a44964da13" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_9bbe0e28-a920-4325-bc68-de16b46c26e5" xlink:to="loc_us-gaap_AssetsAbstract_6bb6851c-0a5b-4f8a-9bdc-d0a44964da13" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment_2fa213df-0a22-47a3-87da-719b9fd9154f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_6bb6851c-0a5b-4f8a-9bdc-d0a44964da13" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment_2fa213df-0a22-47a3-87da-719b9fd9154f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_DisposalGroupIncludingDiscontinuedOperationRightOfUseAsset_50dec84a-3659-44e6-b3e9-2b1cd1038276" xlink:href="glpi-20210630.xsd#glpi_DisposalGroupIncludingDiscontinuedOperationRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_6bb6851c-0a5b-4f8a-9bdc-d0a44964da13" xlink:to="loc_glpi_DisposalGroupIncludingDiscontinuedOperationRightOfUseAsset_50dec84a-3659-44e6-b3e9-2b1cd1038276" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents_fe15114a-153d-448f-a0f1-a381a3fdd2ea" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_6bb6851c-0a5b-4f8a-9bdc-d0a44964da13" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents_fe15114a-153d-448f-a0f1-a381a3fdd2ea" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_DisposalGroupIncludingDiscontinuedOperationPrepaidExpenses_040d1437-a8f5-4042-a867-dc5af54d1e7b" xlink:href="glpi-20210630.xsd#glpi_DisposalGroupIncludingDiscontinuedOperationPrepaidExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_6bb6851c-0a5b-4f8a-9bdc-d0a44964da13" xlink:to="loc_glpi_DisposalGroupIncludingDiscontinuedOperationPrepaidExpenses_040d1437-a8f5-4042-a867-dc5af54d1e7b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1_ceb7c2ad-3c4a-421a-9340-2a5baacfd518" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_6bb6851c-0a5b-4f8a-9bdc-d0a44964da13" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1_ceb7c2ad-3c4a-421a-9340-2a5baacfd518" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssets_3a1ebd6d-980f-4270-897f-27ace3ac7545" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_6bb6851c-0a5b-4f8a-9bdc-d0a44964da13" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssets_3a1ebd6d-980f-4270-897f-27ace3ac7545" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherAssets_beb3f079-1deb-4ce7-8898-56be9cf30b3d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_6bb6851c-0a5b-4f8a-9bdc-d0a44964da13" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherAssets_beb3f079-1deb-4ce7-8898-56be9cf30b3d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation_e180af1e-bbd3-45b1-870c-50a1744b6b4c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_6bb6851c-0a5b-4f8a-9bdc-d0a44964da13" xlink:to="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation_e180af1e-bbd3-45b1-870c-50a1744b6b4c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_da7b6ee4-4035-44bd-b08b-aa7dcf063e42" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_9bbe0e28-a920-4325-bc68-de16b46c26e5" xlink:to="loc_us-gaap_LiabilitiesAbstract_da7b6ee4-4035-44bd-b08b-aa7dcf063e42" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayable_041e2f4e-8636-4a9c-ade1-b716fc5f6efe" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_da7b6ee4-4035-44bd-b08b-aa7dcf063e42" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayable_041e2f4e-8636-4a9c-ade1-b716fc5f6efe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities_f96d60ed-a6d0-49d4-9620-619642d88385" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_da7b6ee4-4035-44bd-b08b-aa7dcf063e42" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities_f96d60ed-a6d0-49d4-9620-619642d88385" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_DisposalGroupIncludingDiscontinuedOperationSalariesAndWages_b8203829-1af7-4b1a-b468-402e1b0d3789" xlink:href="glpi-20210630.xsd#glpi_DisposalGroupIncludingDiscontinuedOperationSalariesAndWages"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_da7b6ee4-4035-44bd-b08b-aa7dcf063e42" xlink:to="loc_glpi_DisposalGroupIncludingDiscontinuedOperationSalariesAndWages_b8203829-1af7-4b1a-b468-402e1b0d3789" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_DisposalGroupIncludingDiscontinuedOperationGamingPropertyAndOtherTaxes_b7199f47-3d77-42bd-9996-a3606f4ee13c" xlink:href="glpi-20210630.xsd#glpi_DisposalGroupIncludingDiscontinuedOperationGamingPropertyAndOtherTaxes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_da7b6ee4-4035-44bd-b08b-aa7dcf063e42" xlink:to="loc_glpi_DisposalGroupIncludingDiscontinuedOperationGamingPropertyAndOtherTaxes_b7199f47-3d77-42bd-9996-a3606f4ee13c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_DisposalGroupIncludingDiscontinuedOperationLeaseLiabilities_08018725-ef08-45fa-ad21-a781154af6bc" xlink:href="glpi-20210630.xsd#glpi_DisposalGroupIncludingDiscontinuedOperationLeaseLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_da7b6ee4-4035-44bd-b08b-aa7dcf063e42" xlink:to="loc_glpi_DisposalGroupIncludingDiscontinuedOperationLeaseLiabilities_08018725-ef08-45fa-ad21-a781154af6bc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherLiabilities_3fe40310-21ad-46fb-9623-a418f4f4e087" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_da7b6ee4-4035-44bd-b08b-aa7dcf063e42" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherLiabilities_3fe40310-21ad-46fb-9623-a418f4f4e087" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation_28a098d2-06c7-4225-a77e-fcf20d1aa9f3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_da7b6ee4-4035-44bd-b08b-aa7dcf063e42" xlink:to="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation_28a098d2-06c7-4225-a77e-fcf20d1aa9f3" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable_ec777588-11cc-40b8-a6c8-d78e34321114" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_9bbe0e28-a920-4325-bc68-de16b46c26e5" xlink:to="loc_us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable_ec777588-11cc-40b8-a6c8-d78e34321114" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_32f46e01-0230-4bf2-954c-076acc52f213" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable_ec777588-11cc-40b8-a6c8-d78e34321114" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_32f46e01-0230-4bf2-954c-076acc52f213" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_32f46e01-0230-4bf2-954c-076acc52f213_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_32f46e01-0230-4bf2-954c-076acc52f213" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_32f46e01-0230-4bf2-954c-076acc52f213_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_2706c0bc-f135-4654-8784-025a36484f86" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_32f46e01-0230-4bf2-954c-076acc52f213" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_2706c0bc-f135-4654-8784-025a36484f86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationsHeldforsaleMember_0c70e29f-e266-4e89-a43f-3d1627dfb954" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DiscontinuedOperationsHeldforsaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_2706c0bc-f135-4654-8784-025a36484f86" xlink:to="loc_us-gaap_DiscontinuedOperationsHeldforsaleMember_0c70e29f-e266-4e89-a43f-3d1627dfb954" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_175dc1df-ebc5-4987-9d7d-f71028cb96e8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable_ec777588-11cc-40b8-a6c8-d78e34321114" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_175dc1df-ebc5-4987-9d7d-f71028cb96e8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_175dc1df-ebc5-4987-9d7d-f71028cb96e8_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_175dc1df-ebc5-4987-9d7d-f71028cb96e8" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_175dc1df-ebc5-4987-9d7d-f71028cb96e8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_f97e8776-ed01-486c-b36a-eedfe7257f7c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_175dc1df-ebc5-4987-9d7d-f71028cb96e8" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_f97e8776-ed01-486c-b36a-eedfe7257f7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesMember_d36c221b-ba4d-45b1-aaff-4e9aa0a438c8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_f97e8776-ed01-486c-b36a-eedfe7257f7c" xlink:to="loc_us-gaap_OtherLiabilitiesMember_d36c221b-ba4d-45b1-aaff-4e9aa0a438c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_16ff5154-b94f-43b8-829e-0f3f39ff6b0c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable_ec777588-11cc-40b8-a6c8-d78e34321114" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_16ff5154-b94f-43b8-829e-0f3f39ff6b0c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_16ff5154-b94f-43b8-829e-0f3f39ff6b0c_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_16ff5154-b94f-43b8-829e-0f3f39ff6b0c" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_16ff5154-b94f-43b8-829e-0f3f39ff6b0c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ec2f34c6-4b8e-4d50-9cb5-587f3898a5e5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_16ff5154-b94f-43b8-829e-0f3f39ff6b0c" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ec2f34c6-4b8e-4d50-9cb5-587f3898a5e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_TropicanaLasVegasMember_19d45aca-3dd8-4ee5-8a4c-99134a6a53e2" xlink:href="glpi-20210630.xsd#glpi_TropicanaLasVegasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ec2f34c6-4b8e-4d50-9cb5-587f3898a5e5" xlink:to="loc_glpi_TropicanaLasVegasMember_19d45aca-3dd8-4ee5-8a4c-99134a6a53e2" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.glpropinc.com/role/LeaseAssetsandLeaseLiabilitiesLeaseAssetsandLeaseLiabilitiesLeaseAssetsDetails" xlink:type="simple" xlink:href="glpi-20210630.xsd#LeaseAssetsandLeaseLiabilitiesLeaseAssetsandLeaseLiabilitiesLeaseAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.glpropinc.com/role/LeaseAssetsandLeaseLiabilitiesLeaseAssetsandLeaseLiabilitiesLeaseAssetsDetails" xlink:type="extended" id="i4734218034ce49cfaebca887c799c494_LeaseAssetsandLeaseLiabilitiesLeaseAssetsandLeaseLiabilitiesLeaseAssetsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_a8261436-b352-4558-b54a-39c62a05aba0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_72666feb-d8b2-4b44-9c9a-12c8e2a37535" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_a8261436-b352-4558-b54a-39c62a05aba0" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_72666feb-d8b2-4b44-9c9a-12c8e2a37535" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_b45565fd-9122-4a3c-85c6-976113a373a4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_a8261436-b352-4558-b54a-39c62a05aba0" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_b45565fd-9122-4a3c-85c6-976113a373a4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_96467c20-d5e0-486f-9873-2b702dbdb62f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_b45565fd-9122-4a3c-85c6-976113a373a4" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_96467c20-d5e0-486f-9873-2b702dbdb62f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_96467c20-d5e0-486f-9873-2b702dbdb62f_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_96467c20-d5e0-486f-9873-2b702dbdb62f" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_96467c20-d5e0-486f-9873-2b702dbdb62f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_2c883688-e044-4eb9-a2fc-16c2cbf6c68a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_96467c20-d5e0-486f-9873-2b702dbdb62f" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_2c883688-e044-4eb9-a2fc-16c2cbf6c68a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeaseRightofUseAssetsExcludingLandRightsMember_5654280c-594d-45c2-8cac-2f084758b272" xlink:href="glpi-20210630.xsd#glpi_OperatingLeaseRightofUseAssetsExcludingLandRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_2c883688-e044-4eb9-a2fc-16c2cbf6c68a" xlink:to="loc_glpi_OperatingLeaseRightofUseAssetsExcludingLandRightsMember_5654280c-594d-45c2-8cac-2f084758b272" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_LandRightsMember_6444b4f7-1152-46e6-8f17-073018b2b343" xlink:href="glpi-20210630.xsd#glpi_LandRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_2c883688-e044-4eb9-a2fc-16c2cbf6c68a" xlink:to="loc_glpi_LandRightsMember_6444b4f7-1152-46e6-8f17-073018b2b343" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_fb9106ca-2e00-40dd-9981-aa130f9892ca" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_b45565fd-9122-4a3c-85c6-976113a373a4" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_fb9106ca-2e00-40dd-9981-aa130f9892ca" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_fb9106ca-2e00-40dd-9981-aa130f9892ca_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_fb9106ca-2e00-40dd-9981-aa130f9892ca" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_fb9106ca-2e00-40dd-9981-aa130f9892ca_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_9c590d12-b447-4a4b-a3fd-90e43ce4caa7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_fb9106ca-2e00-40dd-9981-aa130f9892ca" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_9c590d12-b447-4a4b-a3fd-90e43ce4caa7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_AssetsHeldForSaleMember_8697eb93-c709-4d6d-8bfa-c4bb494f99f1" xlink:href="glpi-20210630.xsd#glpi_AssetsHeldForSaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_9c590d12-b447-4a4b-a3fd-90e43ce4caa7" xlink:to="loc_glpi_AssetsHeldForSaleMember_8697eb93-c709-4d6d-8bfa-c4bb494f99f1" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.glpropinc.com/role/LeaseAssetsandLeaseLiabilitiesLeaseAssetsandLeaseLIabilitiesLandRightsDetails" xlink:type="simple" xlink:href="glpi-20210630.xsd#LeaseAssetsandLeaseLiabilitiesLeaseAssetsandLeaseLIabilitiesLandRightsDetails"/>
  <link:definitionLink xlink:role="http://www.glpropinc.com/role/LeaseAssetsandLeaseLiabilitiesLeaseAssetsandLeaseLIabilitiesLandRightsDetails" xlink:type="extended" id="ie19eee193e7a47b6a9ca0633a355c505_LeaseAssetsandLeaseLiabilitiesLeaseAssetsandLeaseLIabilitiesLandRightsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_ffdc1488-8de9-4f87-9586-b3dd0bf7befa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1_82281b7b-daa9-4b3c-a306-138a8c02fbaf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_ffdc1488-8de9-4f87-9586-b3dd0bf7befa" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1_82281b7b-daa9-4b3c-a306-138a8c02fbaf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GroundLeasesGross_8406aa5d-7e86-481e-975d-e9702e729269" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GroundLeasesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_ffdc1488-8de9-4f87-9586-b3dd0bf7befa" xlink:to="loc_us-gaap_GroundLeasesGross_8406aa5d-7e86-481e-975d-e9702e729269" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GroundLeasesAccumulatedAmortization_866aa795-945a-4b11-b11c-3dc2dde98e2e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GroundLeasesAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_ffdc1488-8de9-4f87-9586-b3dd0bf7befa" xlink:to="loc_us-gaap_GroundLeasesAccumulatedAmortization_866aa795-945a-4b11-b11c-3dc2dde98e2e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GroundLeasesNet_81c73352-3283-4acf-b258-fa2e9810f09a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GroundLeasesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_ffdc1488-8de9-4f87-9586-b3dd0bf7befa" xlink:to="loc_us-gaap_GroundLeasesNet_81c73352-3283-4acf-b258-fa2e9810f09a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseCurrentAndFiveSucceedingFiscalYearsAbstract_eee7a7de-952f-4490-865b-d02dd2061e35" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseCurrentAndFiveSucceedingFiscalYearsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_ffdc1488-8de9-4f87-9586-b3dd0bf7befa" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseCurrentAndFiveSucceedingFiscalYearsAbstract_eee7a7de-952f-4490-865b-d02dd2061e35" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_6117483c-376d-4d0e-a238-a906867e2cae" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseCurrentAndFiveSucceedingFiscalYearsAbstract_eee7a7de-952f-4490-865b-d02dd2061e35" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_6117483c-376d-4d0e-a238-a906867e2cae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_cff10d10-4e68-43c9-9fd6-a763f9a1d22e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseCurrentAndFiveSucceedingFiscalYearsAbstract_eee7a7de-952f-4490-865b-d02dd2061e35" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_cff10d10-4e68-43c9-9fd6-a763f9a1d22e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_a21c5d1e-1c4f-43ad-8a77-10e6c0a0466a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseCurrentAndFiveSucceedingFiscalYearsAbstract_eee7a7de-952f-4490-865b-d02dd2061e35" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_a21c5d1e-1c4f-43ad-8a77-10e6c0a0466a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_bc0a8448-ea18-43d7-8caf-538b325d5189" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseCurrentAndFiveSucceedingFiscalYearsAbstract_eee7a7de-952f-4490-865b-d02dd2061e35" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_bc0a8448-ea18-43d7-8caf-538b325d5189" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_b94ea9aa-b3ef-4864-8704-631e348d6def" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseCurrentAndFiveSucceedingFiscalYearsAbstract_eee7a7de-952f-4490-865b-d02dd2061e35" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_b94ea9aa-b3ef-4864-8704-631e348d6def" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour_6d157daa-1bb8-4690-9b8c-aeba7fefc2b2" xlink:href="glpi-20210630.xsd#glpi_FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseCurrentAndFiveSucceedingFiscalYearsAbstract_eee7a7de-952f-4490-865b-d02dd2061e35" xlink:to="loc_glpi_FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour_6d157daa-1bb8-4690-9b8c-aeba7fefc2b2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f3bc9a2f-96af-4560-8150-35a232125b0d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_ffdc1488-8de9-4f87-9586-b3dd0bf7befa" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f3bc9a2f-96af-4560-8150-35a232125b0d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_50970484-7b13-4a39-b993-87e651f0b021" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f3bc9a2f-96af-4560-8150-35a232125b0d" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_50970484-7b13-4a39-b993-87e651f0b021" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_50970484-7b13-4a39-b993-87e651f0b021_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_50970484-7b13-4a39-b993-87e651f0b021" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_50970484-7b13-4a39-b993-87e651f0b021_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_9afdec0a-7930-48a1-8121-3d0db99f7745" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_50970484-7b13-4a39-b993-87e651f0b021" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_9afdec0a-7930-48a1-8121-3d0db99f7745" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_LandRightsMember_956a1761-909b-4184-bb3d-5fa6486bbfaa" xlink:href="glpi-20210630.xsd#glpi_LandRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_9afdec0a-7930-48a1-8121-3d0db99f7745" xlink:to="loc_glpi_LandRightsMember_956a1761-909b-4184-bb3d-5fa6486bbfaa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_ee4b1a43-17f7-4c25-bf1c-eb9a35055aad" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f3bc9a2f-96af-4560-8150-35a232125b0d" xlink:to="loc_srt_RangeAxis_ee4b1a43-17f7-4c25-bf1c-eb9a35055aad" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_ee4b1a43-17f7-4c25-bf1c-eb9a35055aad_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_ee4b1a43-17f7-4c25-bf1c-eb9a35055aad" xlink:to="loc_srt_RangeMember_ee4b1a43-17f7-4c25-bf1c-eb9a35055aad_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_1fdf0fd7-576c-4089-9356-e6e0207bfa32" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_ee4b1a43-17f7-4c25-bf1c-eb9a35055aad" xlink:to="loc_srt_RangeMember_1fdf0fd7-576c-4089-9356-e6e0207bfa32" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_7f0d314c-ed4f-4ff6-b3e3-1fda8fe87159" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_1fdf0fd7-576c-4089-9356-e6e0207bfa32" xlink:to="loc_srt_MinimumMember_7f0d314c-ed4f-4ff6-b3e3-1fda8fe87159" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_28bf8b1c-8eec-4d5c-859d-aee3997adbf4" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_1fdf0fd7-576c-4089-9356-e6e0207bfa32" xlink:to="loc_srt_MaximumMember_28bf8b1c-8eec-4d5c-859d-aee3997adbf4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_ab28d966-98c6-4d59-81b9-cf35fecef29b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f3bc9a2f-96af-4560-8150-35a232125b0d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_ab28d966-98c6-4d59-81b9-cf35fecef29b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_ab28d966-98c6-4d59-81b9-cf35fecef29b_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_ab28d966-98c6-4d59-81b9-cf35fecef29b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_ab28d966-98c6-4d59-81b9-cf35fecef29b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_49e5c333-b8a8-4e78-b355-863202f16f79" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_ab28d966-98c6-4d59-81b9-cf35fecef29b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_49e5c333-b8a8-4e78-b355-863202f16f79" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OffMarketFavorableLeaseMember_716bf9e1-127d-49b6-9102-e1c456ada838" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OffMarketFavorableLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_49e5c333-b8a8-4e78-b355-863202f16f79" xlink:to="loc_us-gaap_OffMarketFavorableLeaseMember_716bf9e1-127d-49b6-9102-e1c456ada838" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.glpropinc.com/role/LeaseAssetsandLeaseLiabilitiesLeaseAssetsandLeaseLiabilitiesComponentsofLeaseExpenseDetails" xlink:type="simple" xlink:href="glpi-20210630.xsd#LeaseAssetsandLeaseLiabilitiesLeaseAssetsandLeaseLiabilitiesComponentsofLeaseExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.glpropinc.com/role/LeaseAssetsandLeaseLiabilitiesLeaseAssetsandLeaseLiabilitiesComponentsofLeaseExpenseDetails" xlink:type="extended" id="ida701295e4384507861235a1a71a1750_LeaseAssetsandLeaseLiabilitiesLeaseAssetsandLeaseLiabilitiesComponentsofLeaseExpenseDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_151af3b9-0949-4f1b-8842-37ee7ffa6eba" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_7ddd852d-141a-4ffd-9cf8-1463f863cd84" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_151af3b9-0949-4f1b-8842-37ee7ffa6eba" xlink:to="loc_us-gaap_OperatingLeaseCost_7ddd852d-141a-4ffd-9cf8-1463f863cd84" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableLeaseCost_7dcf5096-4509-41c2-b37e-96b8e7e432c3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_VariableLeaseCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_151af3b9-0949-4f1b-8842-37ee7ffa6eba" xlink:to="loc_us-gaap_VariableLeaseCost_7dcf5096-4509-41c2-b37e-96b8e7e432c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermLeaseCost_bd726c40-05d8-4263-9a74-c6958cf27b5b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermLeaseCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_151af3b9-0949-4f1b-8842-37ee7ffa6eba" xlink:to="loc_us-gaap_ShortTermLeaseCost_bd726c40-05d8-4263-9a74-c6958cf27b5b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_335d92d8-c202-41d9-b1fa-e0ca0c8b649b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_151af3b9-0949-4f1b-8842-37ee7ffa6eba" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_335d92d8-c202-41d9-b1fa-e0ca0c8b649b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseCost_2fa5ac1d-5d06-460c-8463-fc098d9681ab" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_151af3b9-0949-4f1b-8842-37ee7ffa6eba" xlink:to="loc_us-gaap_LeaseCost_2fa5ac1d-5d06-460c-8463-fc098d9681ab" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_82751ba5-620b-4b1b-865c-3ee3cc6db81b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_151af3b9-0949-4f1b-8842-37ee7ffa6eba" xlink:to="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_82751ba5-620b-4b1b-865c-3ee3cc6db81b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_1ce117e0-265c-4681-84ec-1b7536865896" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_82751ba5-620b-4b1b-865c-3ee3cc6db81b" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_1ce117e0-265c-4681-84ec-1b7536865896" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1ce117e0-265c-4681-84ec-1b7536865896_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_1ce117e0-265c-4681-84ec-1b7536865896" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1ce117e0-265c-4681-84ec-1b7536865896_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_0e32d696-8ae3-4093-83bb-a08a70d13cf5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_1ce117e0-265c-4681-84ec-1b7536865896" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_0e32d696-8ae3-4093-83bb-a08a70d13cf5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_LandRightsMember_8ec70939-31fd-411c-a998-fbc67c25560a" xlink:href="glpi-20210630.xsd#glpi_LandRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_0e32d696-8ae3-4093-83bb-a08a70d13cf5" xlink:to="loc_glpi_LandRightsMember_8ec70939-31fd-411c-a998-fbc67c25560a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.glpropinc.com/role/LongtermDebtScheduleofDebtDetails" xlink:type="simple" xlink:href="glpi-20210630.xsd#LongtermDebtScheduleofDebtDetails"/>
  <link:definitionLink xlink:role="http://www.glpropinc.com/role/LongtermDebtScheduleofDebtDetails" xlink:type="extended" id="i127a2f4a14424e988150792764412e0c_LongtermDebtScheduleofDebtDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_d6e1975b-3a19-458b-ac62-d8bc8df3a80c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_214f4076-b4d6-48fe-9706-7b15e387c05d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d6e1975b-3a19-458b-ac62-d8bc8df3a80c" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_214f4076-b4d6-48fe-9706-7b15e387c05d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_52851827-7018-4345-810e-c23c89459d88" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d6e1975b-3a19-458b-ac62-d8bc8df3a80c" xlink:to="loc_us-gaap_FinanceLeaseLiability_52851827-7018-4345-810e-c23c89459d88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalLeaseObligations_f0a36b60-50ed-427e-af13-08be8a858b7c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CapitalLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d6e1975b-3a19-458b-ac62-d8bc8df3a80c" xlink:to="loc_us-gaap_CapitalLeaseObligations_f0a36b60-50ed-427e-af13-08be8a858b7c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_LongTermDebtGrossandLeaseObligations_b66e4c0b-6a77-49a8-8ba1-4160d625f8da" xlink:href="glpi-20210630.xsd#glpi_LongTermDebtGrossandLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d6e1975b-3a19-458b-ac62-d8bc8df3a80c" xlink:to="loc_glpi_LongTermDebtGrossandLeaseObligations_b66e4c0b-6a77-49a8-8ba1-4160d625f8da" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_8f3064f0-5109-40cd-8444-a841203d1440" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d6e1975b-3a19-458b-ac62-d8bc8df3a80c" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_8f3064f0-5109-40cd-8444-a841203d1440" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_d5b69c44-5dd9-4e93-b1f4-f9fbdc6e35bd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d6e1975b-3a19-458b-ac62-d8bc8df3a80c" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_d5b69c44-5dd9-4e93-b1f4-f9fbdc6e35bd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_8e2ca126-f6ca-4aea-9968-b3aaf647a395" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d6e1975b-3a19-458b-ac62-d8bc8df3a80c" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_8e2ca126-f6ca-4aea-9968-b3aaf647a395" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_a0568c85-7a64-48e5-9a23-8693f6982ab8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d6e1975b-3a19-458b-ac62-d8bc8df3a80c" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_a0568c85-7a64-48e5-9a23-8693f6982ab8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_29241515-77a4-4546-ad5c-d69c430b386e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d6e1975b-3a19-458b-ac62-d8bc8df3a80c" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_29241515-77a4-4546-ad5c-d69c430b386e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_2bdeae04-3fc3-4d23-80a4-1f7e34a9ac41" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d6e1975b-3a19-458b-ac62-d8bc8df3a80c" xlink:to="loc_us-gaap_DebtInstrumentTable_2bdeae04-3fc3-4d23-80a4-1f7e34a9ac41" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_cd67bf2d-109a-465f-9ee3-c76b63741b74" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_2bdeae04-3fc3-4d23-80a4-1f7e34a9ac41" xlink:to="loc_us-gaap_CreditFacilityAxis_cd67bf2d-109a-465f-9ee3-c76b63741b74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_cd67bf2d-109a-465f-9ee3-c76b63741b74_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_cd67bf2d-109a-465f-9ee3-c76b63741b74" xlink:to="loc_us-gaap_CreditFacilityDomain_cd67bf2d-109a-465f-9ee3-c76b63741b74_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_1594dcd3-c8cb-4678-9a91-8354654137eb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_cd67bf2d-109a-465f-9ee3-c76b63741b74" xlink:to="loc_us-gaap_CreditFacilityDomain_1594dcd3-c8cb-4678-9a91-8354654137eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_fc91e12d-ee29-4d77-bab6-1004ef0e4691" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_1594dcd3-c8cb-4678-9a91-8354654137eb" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_fc91e12d-ee29-4d77-bab6-1004ef0e4691" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_aaf3ecc0-4bf0-4110-9e6e-697b775724d5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_2bdeae04-3fc3-4d23-80a4-1f7e34a9ac41" xlink:to="loc_us-gaap_DebtInstrumentAxis_aaf3ecc0-4bf0-4110-9e6e-697b775724d5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_aaf3ecc0-4bf0-4110-9e6e-697b775724d5_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_aaf3ecc0-4bf0-4110-9e6e-697b775724d5" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_aaf3ecc0-4bf0-4110-9e6e-697b775724d5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_b7f76651-163d-4d7b-b0f7-932f05a4feb4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_aaf3ecc0-4bf0-4110-9e6e-697b775724d5" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_b7f76651-163d-4d7b-b0f7-932f05a4feb4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_0b1d0de7-8b41-4f3d-b569-d4ef7511c4fb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_b7f76651-163d-4d7b-b0f7-932f05a4feb4" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_0b1d0de7-8b41-4f3d-b569-d4ef7511c4fb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_TermLoanA1FacilityMember_59c43dd8-0a7a-474a-9a8e-c8473ee767ba" xlink:href="glpi-20210630.xsd#glpi_TermLoanA1FacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_b7f76651-163d-4d7b-b0f7-932f05a4feb4" xlink:to="loc_glpi_TermLoanA1FacilityMember_59c43dd8-0a7a-474a-9a8e-c8473ee767ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_SeniorUnsecuredNotes5.375PercentDue2023Member_274da221-f1d8-4bca-acf9-f894ab4cde65" xlink:href="glpi-20210630.xsd#glpi_SeniorUnsecuredNotes5.375PercentDue2023Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_b7f76651-163d-4d7b-b0f7-932f05a4feb4" xlink:to="loc_glpi_SeniorUnsecuredNotes5.375PercentDue2023Member_274da221-f1d8-4bca-acf9-f894ab4cde65" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_SeniorUnsecuredNotes3.35PercentDue2024Member_1d061e0d-2fac-48d5-bf56-2eed0da8f8fd" xlink:href="glpi-20210630.xsd#glpi_SeniorUnsecuredNotes3.35PercentDue2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_b7f76651-163d-4d7b-b0f7-932f05a4feb4" xlink:to="loc_glpi_SeniorUnsecuredNotes3.35PercentDue2024Member_1d061e0d-2fac-48d5-bf56-2eed0da8f8fd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_SeniorUnsecuredNotes5.250PercentDue2025Member_ccf8aff1-bdcf-4858-bda2-e4e3ec1985b5" xlink:href="glpi-20210630.xsd#glpi_SeniorUnsecuredNotes5.250PercentDue2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_b7f76651-163d-4d7b-b0f7-932f05a4feb4" xlink:to="loc_glpi_SeniorUnsecuredNotes5.250PercentDue2025Member_ccf8aff1-bdcf-4858-bda2-e4e3ec1985b5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_SeniorUnsecuredNotes5.375PercentDue2026Member_281d4823-aba8-4cab-bcb1-c4398c871c68" xlink:href="glpi-20210630.xsd#glpi_SeniorUnsecuredNotes5.375PercentDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_b7f76651-163d-4d7b-b0f7-932f05a4feb4" xlink:to="loc_glpi_SeniorUnsecuredNotes5.375PercentDue2026Member_281d4823-aba8-4cab-bcb1-c4398c871c68" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_SeniorUnsecuredNotes5.750PercentDue2028Member_4e50ade8-5e5e-44ae-9bcf-5e89fc6118c3" xlink:href="glpi-20210630.xsd#glpi_SeniorUnsecuredNotes5.750PercentDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_b7f76651-163d-4d7b-b0f7-932f05a4feb4" xlink:to="loc_glpi_SeniorUnsecuredNotes5.750PercentDue2028Member_4e50ade8-5e5e-44ae-9bcf-5e89fc6118c3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_SeniorUnsecuredNotes5.300PercentDue2029Member_8be6be14-205e-44ec-bb9f-260b332debec" xlink:href="glpi-20210630.xsd#glpi_SeniorUnsecuredNotes5.300PercentDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_b7f76651-163d-4d7b-b0f7-932f05a4feb4" xlink:to="loc_glpi_SeniorUnsecuredNotes5.300PercentDue2029Member_8be6be14-205e-44ec-bb9f-260b332debec" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_SeniorUnsecuredNotes4.00PercentDue2030Member_d77c7eae-a83f-4cdb-8218-c88ad9b08184" xlink:href="glpi-20210630.xsd#glpi_SeniorUnsecuredNotes4.00PercentDue2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_b7f76651-163d-4d7b-b0f7-932f05a4feb4" xlink:to="loc_glpi_SeniorUnsecuredNotes4.00PercentDue2030Member_d77c7eae-a83f-4cdb-8218-c88ad9b08184" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_TermLoanA2FacilityMember_24bb9b68-fbe7-4b6b-8758-e5253512aead" xlink:href="glpi-20210630.xsd#glpi_TermLoanA2FacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_b7f76651-163d-4d7b-b0f7-932f05a4feb4" xlink:to="loc_glpi_TermLoanA2FacilityMember_24bb9b68-fbe7-4b6b-8758-e5253512aead" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_SeniorUnsecuredNotes400PercentDue2031Member_c4f9df3b-6df3-47a5-b4c2-11fae5cda17e" xlink:href="glpi-20210630.xsd#glpi_SeniorUnsecuredNotes400PercentDue2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_b7f76651-163d-4d7b-b0f7-932f05a4feb4" xlink:to="loc_glpi_SeniorUnsecuredNotes400PercentDue2031Member_c4f9df3b-6df3-47a5-b4c2-11fae5cda17e" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.glpropinc.com/role/LongtermDebtSeniorUnsecuredCreditFacilityNarrativeDetails" xlink:type="simple" xlink:href="glpi-20210630.xsd#LongtermDebtSeniorUnsecuredCreditFacilityNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.glpropinc.com/role/LongtermDebtSeniorUnsecuredCreditFacilityNarrativeDetails" xlink:type="extended" id="i84b0ecf8840c472a8c57de00c3970637_LongtermDebtSeniorUnsecuredCreditFacilityNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_85e4df6d-0ef2-4a5e-b328-93167fa44b13" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_68368210-0704-4df4-80f5-b3b8c934648a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_85e4df6d-0ef2-4a5e-b328-93167fa44b13" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_68368210-0704-4df4-80f5-b3b8c934648a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_65f230fa-bc13-4f21-a447-a322a663e6c5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_85e4df6d-0ef2-4a5e-b328-93167fa44b13" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_65f230fa-bc13-4f21-a447-a322a663e6c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_4e307e54-9e8b-4656-871e-2e4a38e369cb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_85e4df6d-0ef2-4a5e-b328-93167fa44b13" xlink:to="loc_us-gaap_LineOfCredit_4e307e54-9e8b-4656-871e-2e4a38e369cb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_df1ca0c0-ece4-47b5-9800-27f55c4fcbc2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_85e4df6d-0ef2-4a5e-b328-93167fa44b13" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_df1ca0c0-ece4-47b5-9800-27f55c4fcbc2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_12589b95-d4c6-4c16-ae94-7337548b4840" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_85e4df6d-0ef2-4a5e-b328-93167fa44b13" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_12589b95-d4c6-4c16-ae94-7337548b4840" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_ef663bcd-6645-493b-bafa-8a5fb84ea0b3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_85e4df6d-0ef2-4a5e-b328-93167fa44b13" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_ef663bcd-6645-493b-bafa-8a5fb84ea0b3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_95189a26-2400-45ca-af5b-a546c26443c0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_85e4df6d-0ef2-4a5e-b328-93167fa44b13" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_95189a26-2400-45ca-af5b-a546c26443c0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_41ed27c7-bd7c-4ceb-a419-39a31814009e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_85e4df6d-0ef2-4a5e-b328-93167fa44b13" xlink:to="loc_us-gaap_DebtInstrumentTable_41ed27c7-bd7c-4ceb-a419-39a31814009e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_550d08f3-ec2a-4b1c-b4b7-2dbefd8e5d88" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_41ed27c7-bd7c-4ceb-a419-39a31814009e" xlink:to="loc_us-gaap_CreditFacilityAxis_550d08f3-ec2a-4b1c-b4b7-2dbefd8e5d88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_550d08f3-ec2a-4b1c-b4b7-2dbefd8e5d88_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_550d08f3-ec2a-4b1c-b4b7-2dbefd8e5d88" xlink:to="loc_us-gaap_CreditFacilityDomain_550d08f3-ec2a-4b1c-b4b7-2dbefd8e5d88_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_e85aa5ff-e52a-4fff-9344-72e28ba7e132" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_550d08f3-ec2a-4b1c-b4b7-2dbefd8e5d88" xlink:to="loc_us-gaap_CreditFacilityDomain_e85aa5ff-e52a-4fff-9344-72e28ba7e132" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_3c0d9307-7e0e-466b-b74a-a450c5717f57" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_e85aa5ff-e52a-4fff-9344-72e28ba7e132" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_3c0d9307-7e0e-466b-b74a-a450c5717f57" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_TermLoanA1FacilityMember_d28d862d-0c34-44d9-8bc6-c0b104e4cc73" xlink:href="glpi-20210630.xsd#glpi_TermLoanA1FacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_e85aa5ff-e52a-4fff-9344-72e28ba7e132" xlink:to="loc_glpi_TermLoanA1FacilityMember_d28d862d-0c34-44d9-8bc6-c0b104e4cc73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_IncrementalTermLoanA2FacilityMember_7c246081-490f-4f70-a6dc-9dccc2f4fbdb" xlink:href="glpi-20210630.xsd#glpi_IncrementalTermLoanA2FacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_e85aa5ff-e52a-4fff-9344-72e28ba7e132" xlink:to="loc_glpi_IncrementalTermLoanA2FacilityMember_7c246081-490f-4f70-a6dc-9dccc2f4fbdb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_6fcb63e4-1454-4034-bbb2-38b256a02280" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_41ed27c7-bd7c-4ceb-a419-39a31814009e" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_6fcb63e4-1454-4034-bbb2-38b256a02280" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_6fcb63e4-1454-4034-bbb2-38b256a02280_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_6fcb63e4-1454-4034-bbb2-38b256a02280" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_6fcb63e4-1454-4034-bbb2-38b256a02280_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_02b214db-2615-4684-a61d-3dabc026f1e4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_6fcb63e4-1454-4034-bbb2-38b256a02280" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_02b214db-2615-4684-a61d-3dabc026f1e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_c23b591f-607d-4d90-babf-50303fd5e5c4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_02b214db-2615-4684-a61d-3dabc026f1e4" xlink:to="loc_us-gaap_LineOfCreditMember_c23b591f-607d-4d90-babf-50303fd5e5c4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_da306870-cfd1-40cf-96ff-a3f3b1d26c48" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_41ed27c7-bd7c-4ceb-a419-39a31814009e" xlink:to="loc_us-gaap_DebtInstrumentAxis_da306870-cfd1-40cf-96ff-a3f3b1d26c48" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_da306870-cfd1-40cf-96ff-a3f3b1d26c48_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_da306870-cfd1-40cf-96ff-a3f3b1d26c48" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_da306870-cfd1-40cf-96ff-a3f3b1d26c48_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_6fb671e8-d12b-4159-91e0-a4e018809055" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_da306870-cfd1-40cf-96ff-a3f3b1d26c48" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_6fb671e8-d12b-4159-91e0-a4e018809055" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_SeniorUnsecuredNotes400PercentDue2031Member_314c7632-76f5-4f84-b2b4-8bb44e4362b1" xlink:href="glpi-20210630.xsd#glpi_SeniorUnsecuredNotes400PercentDue2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6fb671e8-d12b-4159-91e0-a4e018809055" xlink:to="loc_glpi_SeniorUnsecuredNotes400PercentDue2031Member_314c7632-76f5-4f84-b2b4-8bb44e4362b1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_SeniorUnsecuredNotes4.00PercentDue2030Member_3bf4af92-465b-40f6-9e28-77ffb73ac136" xlink:href="glpi-20210630.xsd#glpi_SeniorUnsecuredNotes4.00PercentDue2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6fb671e8-d12b-4159-91e0-a4e018809055" xlink:to="loc_glpi_SeniorUnsecuredNotes4.00PercentDue2030Member_3bf4af92-465b-40f6-9e28-77ffb73ac136" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.glpropinc.com/role/LongtermDebtSeniorUnsecuredNotesNarrativeDetails" xlink:type="simple" xlink:href="glpi-20210630.xsd#LongtermDebtSeniorUnsecuredNotesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.glpropinc.com/role/LongtermDebtSeniorUnsecuredNotesNarrativeDetails" xlink:type="extended" id="i4009eea809084211aa9031a761d3adbe_LongtermDebtSeniorUnsecuredNotesNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_5b205556-c49e-4012-93b2-a1cb806d1260" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_394cea6d-3f61-4a0f-84dd-cafb5a213da0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5b205556-c49e-4012-93b2-a1cb806d1260" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_394cea6d-3f61-4a0f-84dd-cafb5a213da0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_e48c68fa-c1ef-4832-b984-355a2c6b5392" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5b205556-c49e-4012-93b2-a1cb806d1260" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_e48c68fa-c1ef-4832-b984-355a2c6b5392" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_75621016-7fb5-407f-beaf-005fb6114400" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5b205556-c49e-4012-93b2-a1cb806d1260" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_75621016-7fb5-407f-beaf-005fb6114400" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfDebt_41de7774-2513-446a-835f-fed42f31a8ee" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RepaymentsOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5b205556-c49e-4012-93b2-a1cb806d1260" xlink:to="loc_us-gaap_RepaymentsOfDebt_41de7774-2513-446a-835f-fed42f31a8ee" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_c14e3b1b-fac4-44a0-b51c-598f35a3cbe1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5b205556-c49e-4012-93b2-a1cb806d1260" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_c14e3b1b-fac4-44a0-b51c-598f35a3cbe1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_844d7580-caea-4464-8f3c-4d0402974e47" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5b205556-c49e-4012-93b2-a1cb806d1260" xlink:to="loc_us-gaap_DebtInstrumentTable_844d7580-caea-4464-8f3c-4d0402974e47" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_e4e7bb04-445f-4967-aef3-c90216cf1461" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_844d7580-caea-4464-8f3c-4d0402974e47" xlink:to="loc_us-gaap_DebtInstrumentAxis_e4e7bb04-445f-4967-aef3-c90216cf1461" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_e4e7bb04-445f-4967-aef3-c90216cf1461_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_e4e7bb04-445f-4967-aef3-c90216cf1461" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_e4e7bb04-445f-4967-aef3-c90216cf1461_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_69d1a48f-c4db-4d06-9c83-6f90ee00b3c8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_e4e7bb04-445f-4967-aef3-c90216cf1461" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_69d1a48f-c4db-4d06-9c83-6f90ee00b3c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_SeniorUnsecuredNotes3.35PercentDue2024Member_07365023-375b-464c-83fd-07390def5ee4" xlink:href="glpi-20210630.xsd#glpi_SeniorUnsecuredNotes3.35PercentDue2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_69d1a48f-c4db-4d06-9c83-6f90ee00b3c8" xlink:to="loc_glpi_SeniorUnsecuredNotes3.35PercentDue2024Member_07365023-375b-464c-83fd-07390def5ee4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_SeniorUnsecuredNotes4.00PercentDue2030Member_b907a75f-1868-425b-8a63-ec6bee359955" xlink:href="glpi-20210630.xsd#glpi_SeniorUnsecuredNotes4.00PercentDue2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_69d1a48f-c4db-4d06-9c83-6f90ee00b3c8" xlink:to="loc_glpi_SeniorUnsecuredNotes4.00PercentDue2030Member_b907a75f-1868-425b-8a63-ec6bee359955" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_SeniorUnsecuredNotes4.875PercentDue2020Member_4f694a96-5cc9-462a-bb97-62c424f54d4f" xlink:href="glpi-20210630.xsd#glpi_SeniorUnsecuredNotes4.875PercentDue2020Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_69d1a48f-c4db-4d06-9c83-6f90ee00b3c8" xlink:to="loc_glpi_SeniorUnsecuredNotes4.875PercentDue2020Member_4f694a96-5cc9-462a-bb97-62c424f54d4f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_785eb922-ef42-45d6-9049-dc9cd238c6df" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_69d1a48f-c4db-4d06-9c83-6f90ee00b3c8" xlink:to="loc_us-gaap_SeniorNotesMember_785eb922-ef42-45d6-9049-dc9cd238c6df" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_SeniorUnsecuredNotes4.375PercentDue2021Member_5bc7e554-932f-494f-a989-543b3fc92666" xlink:href="glpi-20210630.xsd#glpi_SeniorUnsecuredNotes4.375PercentDue2021Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_69d1a48f-c4db-4d06-9c83-6f90ee00b3c8" xlink:to="loc_glpi_SeniorUnsecuredNotes4.375PercentDue2021Member_5bc7e554-932f-494f-a989-543b3fc92666" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.glpropinc.com/role/FairValueofFinancialAssetsandLiabilitiesFairValueofFinancialAssetsandLIabilitiesAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails" xlink:type="simple" xlink:href="glpi-20210630.xsd#FairValueofFinancialAssetsandLiabilitiesFairValueofFinancialAssetsandLIabilitiesAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.glpropinc.com/role/FairValueofFinancialAssetsandLiabilitiesFairValueofFinancialAssetsandLIabilitiesAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails" xlink:type="extended" id="i3437758346c94abf98cd24d49772a9bf_FairValueofFinancialAssetsandLiabilitiesFairValueofFinancialAssetsandLIabilitiesAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_ecefbd13-aa6e-406f-b081-0a115f9e4add" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_2f2eadcd-8316-4c25-8a45-c8708091eb51" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_ecefbd13-aa6e-406f-b081-0a115f9e4add" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_2f2eadcd-8316-4c25-8a45-c8708091eb51" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_a2d0d2c4-4bf5-4094-94e6-ef82db4743bf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_2f2eadcd-8316-4c25-8a45-c8708091eb51" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_a2d0d2c4-4bf5-4094-94e6-ef82db4743bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_Deferredcompensationplanassetsfairvaluedisclosure_2cb7ea01-7a7b-464b-8a60-8ca43541e4d8" xlink:href="glpi-20210630.xsd#glpi_Deferredcompensationplanassetsfairvaluedisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_2f2eadcd-8316-4c25-8a45-c8708091eb51" xlink:to="loc_glpi_Deferredcompensationplanassetsfairvaluedisclosure_2cb7ea01-7a7b-464b-8a60-8ca43541e4d8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_2bbedd20-7f36-44ce-9665-bd2334e194c5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_ecefbd13-aa6e-406f-b081-0a115f9e4add" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_2bbedd20-7f36-44ce-9665-bd2334e194c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_f13877a6-f9f4-4aaa-95cb-88db83f1ad00" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_2bbedd20-7f36-44ce-9665-bd2334e194c5" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_f13877a6-f9f4-4aaa-95cb-88db83f1ad00" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LinesOfCreditFairValueDisclosure_f4e92536-826e-42be-ac7c-09b054958a01" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LinesOfCreditFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_f13877a6-f9f4-4aaa-95cb-88db83f1ad00" xlink:to="loc_us-gaap_LinesOfCreditFairValueDisclosure_f4e92536-826e-42be-ac7c-09b054958a01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableFairValueDisclosure_2bd20cda-4da5-4a30-b2b2-9418cb8b486d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NotesPayableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_f13877a6-f9f4-4aaa-95cb-88db83f1ad00" xlink:to="loc_us-gaap_NotesPayableFairValueDisclosure_2bd20cda-4da5-4a30-b2b2-9418cb8b486d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_14c76d73-7767-4f90-b023-1e696006d16c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_ecefbd13-aa6e-406f-b081-0a115f9e4add" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_14c76d73-7767-4f90-b023-1e696006d16c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_13cebe6e-4f73-4166-996d-8714f47a1da0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_14c76d73-7767-4f90-b023-1e696006d16c" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_13cebe6e-4f73-4166-996d-8714f47a1da0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_13cebe6e-4f73-4166-996d-8714f47a1da0_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_13cebe6e-4f73-4166-996d-8714f47a1da0" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_13cebe6e-4f73-4166-996d-8714f47a1da0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_2386d68a-a681-4fad-bf24-843ae9880aa7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_13cebe6e-4f73-4166-996d-8714f47a1da0" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_2386d68a-a681-4fad-bf24-843ae9880aa7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_40b0c9b9-ced8-44a9-af78-91c1352a6d31" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_2386d68a-a681-4fad-bf24-843ae9880aa7" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_40b0c9b9-ced8-44a9-af78-91c1352a6d31" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_873c2b7a-fcb1-454e-b76d-0f3dc37ef2ef" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_2386d68a-a681-4fad-bf24-843ae9880aa7" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_873c2b7a-fcb1-454e-b76d-0f3dc37ef2ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_667e88f4-0276-4e86-88c1-052ead99195d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_2386d68a-a681-4fad-bf24-843ae9880aa7" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_667e88f4-0276-4e86-88c1-052ead99195d" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.glpropinc.com/role/RevenueRecognitionNarrativeDetails" xlink:type="simple" xlink:href="glpi-20210630.xsd#RevenueRecognitionNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.glpropinc.com/role/RevenueRecognitionNarrativeDetails" xlink:type="extended" id="ica50c2a5edd641f5814089f5fd511f5a_RevenueRecognitionNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_881a86ae-4eba-4e46-b1b6-d51b6714361a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfRealEstateProperties_61595f64-999f-420d-a553-675f5b42d3f3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NumberOfRealEstateProperties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_881a86ae-4eba-4e46-b1b6-d51b6714361a" xlink:to="loc_us-gaap_NumberOfRealEstateProperties_61595f64-999f-420d-a553-675f5b42d3f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_Lessorleasingarrangementstermofcontractincludingallreasonablyassuredrenewalperiods_a0c6b341-1f59-48a1-962c-b088283fe561" xlink:href="glpi-20210630.xsd#glpi_Lessorleasingarrangementstermofcontractincludingallreasonablyassuredrenewalperiods"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_881a86ae-4eba-4e46-b1b6-d51b6714361a" xlink:to="loc_glpi_Lessorleasingarrangementstermofcontractincludingallreasonablyassuredrenewalperiods_a0c6b341-1f59-48a1-962c-b088283fe561" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeaseTermOfContract_6dd117ab-3cc4-4244-a451-5cac2435f590" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LessorOperatingLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_881a86ae-4eba-4e46-b1b6-d51b6714361a" xlink:to="loc_us-gaap_LessorOperatingLeaseTermOfContract_6dd117ab-3cc4-4244-a451-5cac2435f590" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_LessorLeasingArrangementsOperatingLeasesNumberOfRenewalOptions_bba5763f-1548-4c13-b564-9edd0dcfd2eb" xlink:href="glpi-20210630.xsd#glpi_LessorLeasingArrangementsOperatingLeasesNumberOfRenewalOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_881a86ae-4eba-4e46-b1b6-d51b6714361a" xlink:to="loc_glpi_LessorLeasingArrangementsOperatingLeasesNumberOfRenewalOptions_bba5763f-1548-4c13-b564-9edd0dcfd2eb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeaseRenewalTerm_ede98a93-9f97-471c-90fa-6cbde02e142c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LessorOperatingLeaseRenewalTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_881a86ae-4eba-4e46-b1b6-d51b6714361a" xlink:to="loc_us-gaap_LessorOperatingLeaseRenewalTerm_ede98a93-9f97-471c-90fa-6cbde02e142c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_Operatingleasesannualrentalescalationpercentage_b5e894ac-c2b1-4b3f-82f9-05bb5f7ef5af" xlink:href="glpi-20210630.xsd#glpi_Operatingleasesannualrentalescalationpercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_881a86ae-4eba-4e46-b1b6-d51b6714361a" xlink:to="loc_glpi_Operatingleasesannualrentalescalationpercentage_b5e894ac-c2b1-4b3f-82f9-05bb5f7ef5af" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_Operatingleasespercentoftheaveragenetrevenuesofpropertysusedtocalculaterentincrease_26629515-faa8-4d93-a272-8794b560b56f" xlink:href="glpi-20210630.xsd#glpi_Operatingleasespercentoftheaveragenetrevenuesofpropertysusedtocalculaterentincrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_881a86ae-4eba-4e46-b1b6-d51b6714361a" xlink:to="loc_glpi_Operatingleasespercentoftheaveragenetrevenuesofpropertysusedtocalculaterentincrease_26629515-faa8-4d93-a272-8794b560b56f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeasesAnnualRentEscalatorOveraPeriodofTimeContingentUpontheAchievementofCertainRentCoverageRatioThresholdPercentage_8bb1834a-9e90-4339-a964-c8be0573d7ff" xlink:href="glpi-20210630.xsd#glpi_OperatingLeasesAnnualRentEscalatorOveraPeriodofTimeContingentUpontheAchievementofCertainRentCoverageRatioThresholdPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_881a86ae-4eba-4e46-b1b6-d51b6714361a" xlink:to="loc_glpi_OperatingLeasesAnnualRentEscalatorOveraPeriodofTimeContingentUpontheAchievementofCertainRentCoverageRatioThresholdPercentage_8bb1834a-9e90-4339-a964-c8be0573d7ff" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeasesPeriodExistingUponTriggeringAnnualRentEscalatorReset_a5a76250-546a-4a69-9e04-b0cc74d381d2" xlink:href="glpi-20210630.xsd#glpi_OperatingLeasesPeriodExistingUponTriggeringAnnualRentEscalatorReset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_881a86ae-4eba-4e46-b1b6-d51b6714361a" xlink:to="loc_glpi_OperatingLeasesPeriodExistingUponTriggeringAnnualRentEscalatorReset_a5a76250-546a-4a69-9e04-b0cc74d381d2" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeasesAmountofRentAvailableUponTriggeringAnnualRentEscalatorReset_9e15cff7-678e-497a-94fd-1e03206496c6" xlink:href="glpi-20210630.xsd#glpi_OperatingLeasesAmountofRentAvailableUponTriggeringAnnualRentEscalatorReset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_881a86ae-4eba-4e46-b1b6-d51b6714361a" xlink:to="loc_glpi_OperatingLeasesAmountofRentAvailableUponTriggeringAnnualRentEscalatorReset_9e15cff7-678e-497a-94fd-1e03206496c6" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeasesPercentagetoWhichRentEscalationWillbeReducedUponAchievementofCertainThreshold_a721c66e-b51b-4119-92d7-0c217ddb09f6" xlink:href="glpi-20210630.xsd#glpi_OperatingLeasesPercentagetoWhichRentEscalationWillbeReducedUponAchievementofCertainThreshold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_881a86ae-4eba-4e46-b1b6-d51b6714361a" xlink:to="loc_glpi_OperatingLeasesPercentagetoWhichRentEscalationWillbeReducedUponAchievementofCertainThreshold_a721c66e-b51b-4119-92d7-0c217ddb09f6" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_Operatingleasesfrequencythepropertyperformancebasedrentstructureisadjusted_87c1729f-5f03-4fbb-9250-0511b043db99" xlink:href="glpi-20210630.xsd#glpi_Operatingleasesfrequencythepropertyperformancebasedrentstructureisadjusted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_881a86ae-4eba-4e46-b1b6-d51b6714361a" xlink:to="loc_glpi_Operatingleasesfrequencythepropertyperformancebasedrentstructureisadjusted_87c1729f-5f03-4fbb-9250-0511b043db99" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_LessorLeasingArrangementsPeriodUsedinCalculationofAverageNetRevenues_d31cd6a7-569e-4e03-b9d1-f02db2591bd8" xlink:href="glpi-20210630.xsd#glpi_LessorLeasingArrangementsPeriodUsedinCalculationofAverageNetRevenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_881a86ae-4eba-4e46-b1b6-d51b6714361a" xlink:to="loc_glpi_LessorLeasingArrangementsPeriodUsedinCalculationofAverageNetRevenues_d31cd6a7-569e-4e03-b9d1-f02db2591bd8" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_PercentageoftheChangeinNetRevenuesfromthePrecedingMonthUsedToComputeMonthlyRentPaymentsUnderPennMasterLease_352b159d-3183-4bcf-a082-4299f3b0ab03" xlink:href="glpi-20210630.xsd#glpi_PercentageoftheChangeinNetRevenuesfromthePrecedingMonthUsedToComputeMonthlyRentPaymentsUnderPennMasterLease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_881a86ae-4eba-4e46-b1b6-d51b6714361a" xlink:to="loc_glpi_PercentageoftheChangeinNetRevenuesfromthePrecedingMonthUsedToComputeMonthlyRentPaymentsUnderPennMasterLease_352b159d-3183-4bcf-a082-4299f3b0ab03" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_NumberOfMiles_ae4bc9b0-93cf-403c-a7d3-56e207de39f5" xlink:href="glpi-20210630.xsd#glpi_NumberOfMiles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_881a86ae-4eba-4e46-b1b6-d51b6714361a" xlink:to="loc_glpi_NumberOfMiles_ae4bc9b0-93cf-403c-a7d3-56e207de39f5" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndFeeIncomeLoansCommercialRealEstate_8b3ae8b1-5543-4e34-b1ee-084030a28241" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestAndFeeIncomeLoansCommercialRealEstate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_881a86ae-4eba-4e46-b1b6-d51b6714361a" xlink:to="loc_us-gaap_InterestAndFeeIncomeLoansCommercialRealEstate_8b3ae8b1-5543-4e34-b1ee-084030a28241" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_fcffca3f-4b00-4564-a92c-64ac54782841" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_881a86ae-4eba-4e46-b1b6-d51b6714361a" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_fcffca3f-4b00-4564-a92c-64ac54782841" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_0456ee82-b81b-4075-9ccb-8b7b7fb91aed" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_fcffca3f-4b00-4564-a92c-64ac54782841" xlink:to="loc_srt_RangeAxis_0456ee82-b81b-4075-9ccb-8b7b7fb91aed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_0456ee82-b81b-4075-9ccb-8b7b7fb91aed_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_0456ee82-b81b-4075-9ccb-8b7b7fb91aed" xlink:to="loc_srt_RangeMember_0456ee82-b81b-4075-9ccb-8b7b7fb91aed_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_a9ccc4aa-1789-4c45-a5ff-22d742d888e6" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_0456ee82-b81b-4075-9ccb-8b7b7fb91aed" xlink:to="loc_srt_RangeMember_a9ccc4aa-1789-4c45-a5ff-22d742d888e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_6cc0b265-a090-428a-aeaf-964c441cc9ac" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_a9ccc4aa-1789-4c45-a5ff-22d742d888e6" xlink:to="loc_srt_MinimumMember_6cc0b265-a090-428a-aeaf-964c441cc9ac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_24c1f444-036d-48cf-8c9b-ec11bf74cc41" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_a9ccc4aa-1789-4c45-a5ff-22d742d888e6" xlink:to="loc_srt_MaximumMember_24c1f444-036d-48cf-8c9b-ec11bf74cc41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_570500c4-9ed7-46da-9ccc-5aadd403939e" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_fcffca3f-4b00-4564-a92c-64ac54782841" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_570500c4-9ed7-46da-9ccc-5aadd403939e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_570500c4-9ed7-46da-9ccc-5aadd403939e_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_570500c4-9ed7-46da-9ccc-5aadd403939e" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_570500c4-9ed7-46da-9ccc-5aadd403939e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_50a99786-bb1e-401f-b1f3-4b48ce13a956" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_570500c4-9ed7-46da-9ccc-5aadd403939e" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_50a99786-bb1e-401f-b1f3-4b48ce13a956" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_AllPropertiesUnderthePennMasterLeaseExceptHollywoodCasinoColumbusandHollywoodCasinoToledoMember_a04beb8c-c873-47f0-ab92-3cd3d739e967" xlink:href="glpi-20210630.xsd#glpi_AllPropertiesUnderthePennMasterLeaseExceptHollywoodCasinoColumbusandHollywoodCasinoToledoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_50a99786-bb1e-401f-b1f3-4b48ce13a956" xlink:to="loc_glpi_AllPropertiesUnderthePennMasterLeaseExceptHollywoodCasinoColumbusandHollywoodCasinoToledoMember_a04beb8c-c873-47f0-ab92-3cd3d739e967" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_HollywoodCasinoColumbusAndHollywoodCasinoToledoMember_5720eba3-97a7-410a-8d6d-6782fcef2df5" xlink:href="glpi-20210630.xsd#glpi_HollywoodCasinoColumbusAndHollywoodCasinoToledoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_50a99786-bb1e-401f-b1f3-4b48ce13a956" xlink:to="loc_glpi_HollywoodCasinoColumbusAndHollywoodCasinoToledoMember_5720eba3-97a7-410a-8d6d-6782fcef2df5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermAxis_cc456eae-e9bd-41c4-bd27-3e406cfde826" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseContractualTermAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_fcffca3f-4b00-4564-a92c-64ac54782841" xlink:to="loc_us-gaap_LeaseContractualTermAxis_cc456eae-e9bd-41c4-bd27-3e406cfde826" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_cc456eae-e9bd-41c4-bd27-3e406cfde826_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LeaseContractualTermAxis_cc456eae-e9bd-41c4-bd27-3e406cfde826" xlink:to="loc_us-gaap_LeaseContractualTermDomain_cc456eae-e9bd-41c4-bd27-3e406cfde826_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_08d0e67a-407b-4668-bb03-83a1b0a5a0c0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LeaseContractualTermAxis_cc456eae-e9bd-41c4-bd27-3e406cfde826" xlink:to="loc_us-gaap_LeaseContractualTermDomain_08d0e67a-407b-4668-bb03-83a1b0a5a0c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_PennNationalGamingInc.MasterLeaseMember_e386a99b-ae47-4927-a19a-01b85c1a2ca3" xlink:href="glpi-20210630.xsd#glpi_PennNationalGamingInc.MasterLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_08d0e67a-407b-4668-bb03-83a1b0a5a0c0" xlink:to="loc_glpi_PennNationalGamingInc.MasterLeaseMember_e386a99b-ae47-4927-a19a-01b85c1a2ca3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_AmendedPinnacleEntertainmentInc.MasterLeaseMember_510a81fe-dce8-4e35-ba8a-14fdc2f8b451" xlink:href="glpi-20210630.xsd#glpi_AmendedPinnacleEntertainmentInc.MasterLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_08d0e67a-407b-4668-bb03-83a1b0a5a0c0" xlink:to="loc_glpi_AmendedPinnacleEntertainmentInc.MasterLeaseMember_510a81fe-dce8-4e35-ba8a-14fdc2f8b451" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_AmendedAndRestatedCaesarsMasterLeaseMember_3a3b3dcc-3b4c-4bd6-a559-e9174b8c7860" xlink:href="glpi-20210630.xsd#glpi_AmendedAndRestatedCaesarsMasterLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_08d0e67a-407b-4668-bb03-83a1b0a5a0c0" xlink:to="loc_glpi_AmendedAndRestatedCaesarsMasterLeaseMember_3a3b3dcc-3b4c-4bd6-a559-e9174b8c7860" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_BoydGamingCorporationMasterLeaseMember_66a7b73b-881c-411f-a81b-9c02bbdcce1b" xlink:href="glpi-20210630.xsd#glpi_BoydGamingCorporationMasterLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_08d0e67a-407b-4668-bb03-83a1b0a5a0c0" xlink:to="loc_glpi_BoydGamingCorporationMasterLeaseMember_66a7b73b-881c-411f-a81b-9c02bbdcce1b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_BelterraParkLeaseMember_4ffcee8d-e348-460c-a0d5-02e0b3b938dd" xlink:href="glpi-20210630.xsd#glpi_BelterraParkLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_08d0e67a-407b-4668-bb03-83a1b0a5a0c0" xlink:to="loc_glpi_BelterraParkLeaseMember_4ffcee8d-e348-460c-a0d5-02e0b3b938dd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_PennNationalGamingInc.MeadowsLeaseMember_be470c9a-15a1-4d1c-b776-3713f95f9b62" xlink:href="glpi-20210630.xsd#glpi_PennNationalGamingInc.MeadowsLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_08d0e67a-407b-4668-bb03-83a1b0a5a0c0" xlink:to="loc_glpi_PennNationalGamingInc.MeadowsLeaseMember_be470c9a-15a1-4d1c-b776-3713f95f9b62" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_CasinoQueenLeaseMember_a063c3ec-0040-4809-aa56-e0ac974029ac" xlink:href="glpi-20210630.xsd#glpi_CasinoQueenLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_08d0e67a-407b-4668-bb03-83a1b0a5a0c0" xlink:to="loc_glpi_CasinoQueenLeaseMember_a063c3ec-0040-4809-aa56-e0ac974029ac" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_EldoradoMasterLeaseMember_2c87d555-ce48-40c1-8b68-03833cf8c189" xlink:href="glpi-20210630.xsd#glpi_EldoradoMasterLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_08d0e67a-407b-4668-bb03-83a1b0a5a0c0" xlink:to="loc_glpi_EldoradoMasterLeaseMember_2c87d555-ce48-40c1-8b68-03833cf8c189" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.glpropinc.com/role/RevenueRecognitionRentalIncomeTableDetails" xlink:type="simple" xlink:href="glpi-20210630.xsd#RevenueRecognitionRentalIncomeTableDetails"/>
  <link:definitionLink xlink:role="http://www.glpropinc.com/role/RevenueRecognitionRentalIncomeTableDetails" xlink:type="extended" id="i74666266ef364e2ebb9585ef45a80382_RevenueRecognitionRentalIncomeTableDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeaseCashRentReceived_558b9f85-624b-400b-acff-9c6180253626" xlink:href="glpi-20210630.xsd#glpi_OperatingLeaseCashRentReceived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_glpi_OperatingLeaseCashRentReceived_558b9f85-624b-400b-acff-9c6180253626" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StraightLineRentAdjustments_c330e90d-32d6-47f9-9f6a-4856b858ac40" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StraightLineRentAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_us-gaap_StraightLineRentAdjustments_c330e90d-32d6-47f9-9f6a-4856b858ac40" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeaseGroundLeaseIncome_34324760-e837-4b76-96f4-ec2c0242dc4d" xlink:href="glpi-20210630.xsd#glpi_OperatingLeaseGroundLeaseIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_glpi_OperatingLeaseGroundLeaseIncome_34324760-e837-4b76-96f4-ec2c0242dc4d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeaseOtherRentalRevenue_fdfbce85-3d93-47a9-865d-47336b701112" xlink:href="glpi-20210630.xsd#glpi_OperatingLeaseOtherRentalRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_glpi_OperatingLeaseOtherRentalRevenue_fdfbce85-3d93-47a9-865d-47336b701112" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLeaseIncome_966f4e9c-0078-440b-beaa-8ec04047aeac" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLeaseIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_us-gaap_OperatingLeaseLeaseIncome_966f4e9c-0078-440b-beaa-8ec04047aeac" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeasesFutureMinimumBaseGroundPaymentsReceivable_43e6a2e0-075b-4bec-b358-425a693f9511" xlink:href="glpi-20210630.xsd#glpi_OperatingLeasesFutureMinimumBaseGroundPaymentsReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_glpi_OperatingLeasesFutureMinimumBaseGroundPaymentsReceivable_43e6a2e0-075b-4bec-b358-425a693f9511" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_StraightLineRentAdjustmentsNet_e79d583f-be83-4837-a53f-a7a5dea4b7ba" xlink:href="glpi-20210630.xsd#glpi_StraightLineRentAdjustmentsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_glpi_StraightLineRentAdjustmentsNet_e79d583f-be83-4837-a53f-a7a5dea4b7ba" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable_ebbabb4a-c7e3-4367-acc4-71fb944f17fe" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable_ebbabb4a-c7e3-4367-acc4-71fb944f17fe" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeasesFutureIncometoBeRecognized_b231c74b-b954-4f25-9c3a-f19a0a556967" xlink:href="glpi-20210630.xsd#glpi_OperatingLeasesFutureIncometoBeRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_glpi_OperatingLeasesFutureIncometoBeRecognized_b231c74b-b954-4f25-9c3a-f19a0a556967" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeasesFutureMinimumBaseGroundPaymentsReceivableThereafter_5cb8d752-6cc7-4b19-9bfd-36355ca5c52e" xlink:href="glpi-20210630.xsd#glpi_OperatingLeasesFutureMinimumBaseGroundPaymentsReceivableThereafter"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_glpi_OperatingLeasesFutureMinimumBaseGroundPaymentsReceivableThereafter_5cb8d752-6cc7-4b19-9bfd-36355ca5c52e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter_2e5423ea-377b-4758-b72e-27024480cada" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter_2e5423ea-377b-4758-b72e-27024480cada" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeasesFutureIncometoBeRecognizedinFiveYears_a8c93fed-bb3f-4455-b29c-1fea2f47d642" xlink:href="glpi-20210630.xsd#glpi_OperatingLeasesFutureIncometoBeRecognizedinFiveYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_glpi_OperatingLeasesFutureIncometoBeRecognizedinFiveYears_a8c93fed-bb3f-4455-b29c-1fea2f47d642" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeasesFutureMinimumBaseGroundPaymentsReceivableInFiveYears_be34019f-52b9-4f5e-b5cf-2f9909a0727f" xlink:href="glpi-20210630.xsd#glpi_OperatingLeasesFutureMinimumBaseGroundPaymentsReceivableInFiveYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_glpi_OperatingLeasesFutureMinimumBaseGroundPaymentsReceivableInFiveYears_be34019f-52b9-4f5e-b5cf-2f9909a0727f" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_StraightLineRentAdjustmentsinFiveYears_006bb620-a0cb-4cfc-a5e9-61becc9268c9" xlink:href="glpi-20210630.xsd#glpi_StraightLineRentAdjustmentsinFiveYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_glpi_StraightLineRentAdjustmentsinFiveYears_006bb620-a0cb-4cfc-a5e9-61becc9268c9" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears_7b2b336e-f03c-49cc-b516-22fa4aae9677" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears_7b2b336e-f03c-49cc-b516-22fa4aae9677" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeasesFutureIncometoBeRecognizedThereafter_7daf2276-0237-4c02-a7c2-63d74a5a5178" xlink:href="glpi-20210630.xsd#glpi_OperatingLeasesFutureIncometoBeRecognizedThereafter"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_glpi_OperatingLeasesFutureIncometoBeRecognizedThereafter_7daf2276-0237-4c02-a7c2-63d74a5a5178" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_StraightLineRentAdjustmentsThereafter_7d9957ed-4911-4bb0-a6e5-6a3e5bf6a8e9" xlink:href="glpi-20210630.xsd#glpi_StraightLineRentAdjustmentsThereafter"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_glpi_StraightLineRentAdjustmentsThereafter_7d9957ed-4911-4bb0-a6e5-6a3e5bf6a8e9" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeasesFutureIncometoBeRecognizedinFourYears_146bc6a9-8013-445e-b14a-e0dc3e8e69cd" xlink:href="glpi-20210630.xsd#glpi_OperatingLeasesFutureIncometoBeRecognizedinFourYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_glpi_OperatingLeasesFutureIncometoBeRecognizedinFourYears_146bc6a9-8013-445e-b14a-e0dc3e8e69cd" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeasesFutureMinimumBaseGroundPaymentsReceivableInFourYears_0b8ed598-8506-4f1e-b14a-b377dfae84c4" xlink:href="glpi-20210630.xsd#glpi_OperatingLeasesFutureMinimumBaseGroundPaymentsReceivableInFourYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_glpi_OperatingLeasesFutureMinimumBaseGroundPaymentsReceivableInFourYears_0b8ed598-8506-4f1e-b14a-b377dfae84c4" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_StraightLineRentAdjustmentsinFourYears_59849ff2-a256-4df1-946f-8acc8f419b9a" xlink:href="glpi-20210630.xsd#glpi_StraightLineRentAdjustmentsinFourYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_glpi_StraightLineRentAdjustmentsinFourYears_59849ff2-a256-4df1-946f-8acc8f419b9a" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears_ea1b57fa-280a-4844-be12-17cf3482bb8e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears_ea1b57fa-280a-4844-be12-17cf3482bb8e" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeasesFutureIncometoBeRecognizedinThreeYears_3856ce4a-b3a3-4000-a22d-55c801e69ae2" xlink:href="glpi-20210630.xsd#glpi_OperatingLeasesFutureIncometoBeRecognizedinThreeYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_glpi_OperatingLeasesFutureIncometoBeRecognizedinThreeYears_3856ce4a-b3a3-4000-a22d-55c801e69ae2" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeasesFutureMinimumBaseGroundPaymentsReceivableInThreeYears_627e76f9-efcb-4584-8442-9dca8983b4bb" xlink:href="glpi-20210630.xsd#glpi_OperatingLeasesFutureMinimumBaseGroundPaymentsReceivableInThreeYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_glpi_OperatingLeasesFutureMinimumBaseGroundPaymentsReceivableInThreeYears_627e76f9-efcb-4584-8442-9dca8983b4bb" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_StraightLineRentAdjustmentsinThreeYears_9dd8e58e-0774-49ab-baeb-8e2b496f4d6f" xlink:href="glpi-20210630.xsd#glpi_StraightLineRentAdjustmentsinThreeYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_glpi_StraightLineRentAdjustmentsinThreeYears_9dd8e58e-0774-49ab-baeb-8e2b496f4d6f" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears_f3a6a30a-7a07-4787-80ba-0adcb48d5d8b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears_f3a6a30a-7a07-4787-80ba-0adcb48d5d8b" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeasesFutureIncometoBeRecognizedinTwoYears_e61c4b82-6d63-49dd-9aa6-06bbe23f3698" xlink:href="glpi-20210630.xsd#glpi_OperatingLeasesFutureIncometoBeRecognizedinTwoYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_glpi_OperatingLeasesFutureIncometoBeRecognizedinTwoYears_e61c4b82-6d63-49dd-9aa6-06bbe23f3698" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeasesFutureMinimumBaseGroundPaymentsReceivableInTwoYears_4f210dfe-fd7b-4abb-9360-fdbddbd7c948" xlink:href="glpi-20210630.xsd#glpi_OperatingLeasesFutureMinimumBaseGroundPaymentsReceivableInTwoYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_glpi_OperatingLeasesFutureMinimumBaseGroundPaymentsReceivableInTwoYears_4f210dfe-fd7b-4abb-9360-fdbddbd7c948" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_StraightLineRentAdjustmentsinTwoYears_81d5fcba-2fe9-4e26-a081-523eeab9110e" xlink:href="glpi-20210630.xsd#glpi_StraightLineRentAdjustmentsinTwoYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_glpi_StraightLineRentAdjustmentsinTwoYears_81d5fcba-2fe9-4e26-a081-523eeab9110e" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears_99ac5582-0a83-4c57-aaa7-e857e87a328f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears_99ac5582-0a83-4c57-aaa7-e857e87a328f" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeasesFutureMinimumBaseGroundPaymentsReceivableCurrent_ee147e94-1f80-4388-a774-1f2cf7ced133" xlink:href="glpi-20210630.xsd#glpi_OperatingLeasesFutureMinimumBaseGroundPaymentsReceivableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_glpi_OperatingLeasesFutureMinimumBaseGroundPaymentsReceivableCurrent_ee147e94-1f80-4388-a774-1f2cf7ced133" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_StraightLineRentAdjustmentsCurrent_f6733fff-1f79-43b5-9ab3-9050ab9497b4" xlink:href="glpi-20210630.xsd#glpi_StraightLineRentAdjustmentsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_glpi_StraightLineRentAdjustmentsCurrent_f6733fff-1f79-43b5-9ab3-9050ab9497b4" xlink:type="arc" order="30"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent_b718060c-e1a0-4710-9f15-9dc3af799289" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent_b718060c-e1a0-4710-9f15-9dc3af799289" xlink:type="arc" order="31"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_OperatingLeasesFutureIncometoBeRecognizedCurrent_ea331ae6-f32e-4599-8d8e-0e37e977617a" xlink:href="glpi-20210630.xsd#glpi_OperatingLeasesFutureIncometoBeRecognizedCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_glpi_OperatingLeasesFutureIncometoBeRecognizedCurrent_ea331ae6-f32e-4599-8d8e-0e37e977617a" xlink:type="arc" order="32"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseByMajorPropertyClassTable_570d9d77-4a65-4c02-8206-ed9f74700420" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertySubjectToOrAvailableForOperatingLeaseByMajorPropertyClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_8aee0bcb-7088-44e1-af8a-800398bf1b01" xlink:to="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseByMajorPropertyClassTable_570d9d77-4a65-4c02-8206-ed9f74700420" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ae729054-f957-4a80-95a2-6aae44f71f30" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseByMajorPropertyClassTable_570d9d77-4a65-4c02-8206-ed9f74700420" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ae729054-f957-4a80-95a2-6aae44f71f30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_ae729054-f957-4a80-95a2-6aae44f71f30_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ae729054-f957-4a80-95a2-6aae44f71f30" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_ae729054-f957-4a80-95a2-6aae44f71f30_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a3fe8f86-2921-4013-9c10-2d3a655efbb1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ae729054-f957-4a80-95a2-6aae44f71f30" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a3fe8f86-2921-4013-9c10-2d3a655efbb1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_aeb4d598-aeaa-4ef8-8f73-6b81fb608a5e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a3fe8f86-2921-4013-9c10-2d3a655efbb1" xlink:to="loc_us-gaap_BuildingMember_aeb4d598-aeaa-4ef8-8f73-6b81fb608a5e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandMember_42057ce6-892a-4266-a040-4fd2bf878d51" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a3fe8f86-2921-4013-9c10-2d3a655efbb1" xlink:to="loc_us-gaap_LandMember_42057ce6-892a-4266-a040-4fd2bf878d51" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermAxis_5d9a28f9-1b95-4d5b-a034-67bab0ee90fd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseContractualTermAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseByMajorPropertyClassTable_570d9d77-4a65-4c02-8206-ed9f74700420" xlink:to="loc_us-gaap_LeaseContractualTermAxis_5d9a28f9-1b95-4d5b-a034-67bab0ee90fd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_5d9a28f9-1b95-4d5b-a034-67bab0ee90fd_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LeaseContractualTermAxis_5d9a28f9-1b95-4d5b-a034-67bab0ee90fd" xlink:to="loc_us-gaap_LeaseContractualTermDomain_5d9a28f9-1b95-4d5b-a034-67bab0ee90fd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_0f8b2aaa-6113-4f93-999f-82370d95ec5c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LeaseContractualTermAxis_5d9a28f9-1b95-4d5b-a034-67bab0ee90fd" xlink:to="loc_us-gaap_LeaseContractualTermDomain_0f8b2aaa-6113-4f93-999f-82370d95ec5c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertySubjectToOperatingLeaseMember_93b809fd-3800-4226-8f9e-0095da843434" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertySubjectToOperatingLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_0f8b2aaa-6113-4f93-999f-82370d95ec5c" xlink:to="loc_us-gaap_PropertySubjectToOperatingLeaseMember_93b809fd-3800-4226-8f9e-0095da843434" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.glpropinc.com/role/EarningsperShareEarningsperShareWeightedAverageSharesOutstandingDetails" xlink:type="simple" xlink:href="glpi-20210630.xsd#EarningsperShareEarningsperShareWeightedAverageSharesOutstandingDetails"/>
  <link:definitionLink xlink:role="http://www.glpropinc.com/role/EarningsperShareEarningsperShareWeightedAverageSharesOutstandingDetails" xlink:type="extended" id="i570b983750e5466687b7acd11637ae36_EarningsperShareEarningsperShareWeightedAverageSharesOutstandingDetails">
    <link:loc xlink:type="locator" xlink:label="loc_glpi_ScheduleofBasicAndDilutedWeightedAverageCommonSharesOutstandingLineItems_d667bd82-2a01-4871-a68f-d0d5031c68b5" xlink:href="glpi-20210630.xsd#glpi_ScheduleofBasicAndDilutedWeightedAverageCommonSharesOutstandingLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_291a27c2-9c17-4ea8-a3a5-1d89613cf7bf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_ScheduleofBasicAndDilutedWeightedAverageCommonSharesOutstandingLineItems_d667bd82-2a01-4871-a68f-d0d5031c68b5" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_291a27c2-9c17-4ea8-a3a5-1d89613cf7bf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_9b424fbb-f6ea-49cc-b972-99ac8703c816" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_ScheduleofBasicAndDilutedWeightedAverageCommonSharesOutstandingLineItems_d667bd82-2a01-4871-a68f-d0d5031c68b5" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_9b424fbb-f6ea-49cc-b972-99ac8703c816" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_6fdb5baf-5a6b-4906-ac19-252d54a0f2b7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_glpi_ScheduleofBasicAndDilutedWeightedAverageCommonSharesOutstandingLineItems_d667bd82-2a01-4871-a68f-d0d5031c68b5" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_6fdb5baf-5a6b-4906-ac19-252d54a0f2b7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_ScheduleofBasicAndDilutedWeightedAverageCommonSharesOutstandingTable_3930dcc5-1e59-4df1-820e-ef15b7e9a1ab" xlink:href="glpi-20210630.xsd#glpi_ScheduleofBasicAndDilutedWeightedAverageCommonSharesOutstandingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_glpi_ScheduleofBasicAndDilutedWeightedAverageCommonSharesOutstandingLineItems_d667bd82-2a01-4871-a68f-d0d5031c68b5" xlink:to="loc_glpi_ScheduleofBasicAndDilutedWeightedAverageCommonSharesOutstandingTable_3930dcc5-1e59-4df1-820e-ef15b7e9a1ab" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_f23172ce-5137-4324-b881-8d07ba685907" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_glpi_ScheduleofBasicAndDilutedWeightedAverageCommonSharesOutstandingTable_3930dcc5-1e59-4df1-820e-ef15b7e9a1ab" xlink:to="loc_us-gaap_AwardTypeAxis_f23172ce-5137-4324-b881-8d07ba685907" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f23172ce-5137-4324-b881-8d07ba685907_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_f23172ce-5137-4324-b881-8d07ba685907" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f23172ce-5137-4324-b881-8d07ba685907_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b8053fc5-f749-4925-a9ad-9339f4686fc9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_f23172ce-5137-4324-b881-8d07ba685907" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b8053fc5-f749-4925-a9ad-9339f4686fc9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_39b2bd52-7f8b-4222-a956-a664d94024b4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b8053fc5-f749-4925-a9ad-9339f4686fc9" xlink:to="loc_us-gaap_RestrictedStockMember_39b2bd52-7f8b-4222-a956-a664d94024b4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_d1b7ac8b-64bd-4282-ba4d-d49b78ae9777" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b8053fc5-f749-4925-a9ad-9339f4686fc9" xlink:to="loc_us-gaap_PerformanceSharesMember_d1b7ac8b-64bd-4282-ba4d-d49b78ae9777" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.glpropinc.com/role/ShareholdersEquityNarrativeDetails" xlink:type="simple" xlink:href="glpi-20210630.xsd#ShareholdersEquityNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.glpropinc.com/role/ShareholdersEquityNarrativeDetails" xlink:type="extended" id="i66c4bc0f31354fbcb1721772d3df2f14_ShareholdersEquityNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_9f3ea7eb-93cc-417e-8475-e13314c8ff60" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_SaleOfStockSharesAuthorizedtoBeIssuedValueNewShares_65e5cadf-4a0f-4ba6-a5b2-5d517fe2f504" xlink:href="glpi-20210630.xsd#glpi_SaleOfStockSharesAuthorizedtoBeIssuedValueNewShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_9f3ea7eb-93cc-417e-8475-e13314c8ff60" xlink:to="loc_glpi_SaleOfStockSharesAuthorizedtoBeIssuedValueNewShares_65e5cadf-4a0f-4ba6-a5b2-5d517fe2f504" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_SaleOfStockPercentageofCommissiontobePaidonGrossSalesPriceofSharesSold_f0eeda5c-9ed8-4a0b-ab63-db67a74781c9" xlink:href="glpi-20210630.xsd#glpi_SaleOfStockPercentageofCommissiontobePaidonGrossSalesPriceofSharesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_9f3ea7eb-93cc-417e-8475-e13314c8ff60" xlink:to="loc_glpi_SaleOfStockPercentageofCommissiontobePaidonGrossSalesPriceofSharesSold_f0eeda5c-9ed8-4a0b-ab63-db67a74781c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_SaleOfStockPercentageofCommissiontobePaidonSalePriceofBorrowedSharesofCommonStock_d957eebd-db5c-4e54-9a1f-330e9904ff56" xlink:href="glpi-20210630.xsd#glpi_SaleOfStockPercentageofCommissiontobePaidonSalePriceofBorrowedSharesofCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_9f3ea7eb-93cc-417e-8475-e13314c8ff60" xlink:to="loc_glpi_SaleOfStockPercentageofCommissiontobePaidonSalePriceofBorrowedSharesofCommonStock_d957eebd-db5c-4e54-9a1f-330e9904ff56" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_e3447142-c147-4883-8df5-319cf3943d61" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_9f3ea7eb-93cc-417e-8475-e13314c8ff60" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_e3447142-c147-4883-8df5-319cf3943d61" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_fde3a5a7-bae1-4911-8092-ee1dd32c7698" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_e3447142-c147-4883-8df5-319cf3943d61" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_fde3a5a7-bae1-4911-8092-ee1dd32c7698" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_fde3a5a7-bae1-4911-8092-ee1dd32c7698_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_fde3a5a7-bae1-4911-8092-ee1dd32c7698" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_fde3a5a7-bae1-4911-8092-ee1dd32c7698_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_304b1782-922d-47fa-a0de-7576eddcc232" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_fde3a5a7-bae1-4911-8092-ee1dd32c7698" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_304b1782-922d-47fa-a0de-7576eddcc232" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_AtTheMarketProgramMember_4f86da5f-1574-40ad-90d4-030c0b4c847e" xlink:href="glpi-20210630.xsd#glpi_AtTheMarketProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_304b1782-922d-47fa-a0de-7576eddcc232" xlink:to="loc_glpi_AtTheMarketProgramMember_4f86da5f-1574-40ad-90d4-030c0b4c847e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.glpropinc.com/role/StockBasedCompensationStockBasedCompensationNarrativeDetails" xlink:type="simple" xlink:href="glpi-20210630.xsd#StockBasedCompensationStockBasedCompensationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.glpropinc.com/role/StockBasedCompensationStockBasedCompensationNarrativeDetails" xlink:type="extended" id="i9b45f089d8f24848b0cee173b7e60911_StockBasedCompensationStockBasedCompensationNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_fb7939a9-5537-49ad-8509-fcd85011b070" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_09322ba0-b5a3-4ef9-873b-0ee30adafba6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_fb7939a9-5537-49ad-8509-fcd85011b070" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_09322ba0-b5a3-4ef9-873b-0ee30adafba6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_95bc28ad-5fbd-41e8-8409-685c7ba261ec" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_fb7939a9-5537-49ad-8509-fcd85011b070" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_95bc28ad-5fbd-41e8-8409-685c7ba261ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_30107f6c-b21b-43d9-b795-150b50511d7e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_fb7939a9-5537-49ad-8509-fcd85011b070" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_30107f6c-b21b-43d9-b795-150b50511d7e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_5b608d53-61cb-4eef-af19-5b6025053573" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_fb7939a9-5537-49ad-8509-fcd85011b070" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_5b608d53-61cb-4eef-af19-5b6025053573" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_PeriodOfAggregateShareholderReturnUponWhichPercentageOfSharesVestingAtEndOfMeasurementPeriodWillBeBased_bdd2e99f-d21d-4224-9080-2df74ae16345" xlink:href="glpi-20210630.xsd#glpi_PeriodOfAggregateShareholderReturnUponWhichPercentageOfSharesVestingAtEndOfMeasurementPeriodWillBeBased"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_fb7939a9-5537-49ad-8509-fcd85011b070" xlink:to="loc_glpi_PeriodOfAggregateShareholderReturnUponWhichPercentageOfSharesVestingAtEndOfMeasurementPeriodWillBeBased_bdd2e99f-d21d-4224-9080-2df74ae16345" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_PeriodofMSCIUSREITIndexAgainstwhichAggregateShareholderReturnMeasured_aad80c07-03b6-4dae-b04b-787190b8e684" xlink:href="glpi-20210630.xsd#glpi_PeriodofMSCIUSREITIndexAgainstwhichAggregateShareholderReturnMeasured"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_fb7939a9-5537-49ad-8509-fcd85011b070" xlink:to="loc_glpi_PeriodofMSCIUSREITIndexAgainstwhichAggregateShareholderReturnMeasured_aad80c07-03b6-4dae-b04b-787190b8e684" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_SharebasedCompensationArrangementbySharebasedPaymentAwardPercentageofRevenuesFromTripleNetLeases_f60674d9-7dcf-4329-91a3-b85824082b38" xlink:href="glpi-20210630.xsd#glpi_SharebasedCompensationArrangementbySharebasedPaymentAwardPercentageofRevenuesFromTripleNetLeases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_fb7939a9-5537-49ad-8509-fcd85011b070" xlink:to="loc_glpi_SharebasedCompensationArrangementbySharebasedPaymentAwardPercentageofRevenuesFromTripleNetLeases_f60674d9-7dcf-4329-91a3-b85824082b38" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9c56b427-c240-4b96-b5c5-15872f0c8dbb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_fb7939a9-5537-49ad-8509-fcd85011b070" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9c56b427-c240-4b96-b5c5-15872f0c8dbb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_410820f7-5ca5-461b-93b7-f571d3cdcdd9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_VestingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9c56b427-c240-4b96-b5c5-15872f0c8dbb" xlink:to="loc_us-gaap_VestingAxis_410820f7-5ca5-461b-93b7-f571d3cdcdd9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_410820f7-5ca5-461b-93b7-f571d3cdcdd9_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_410820f7-5ca5-461b-93b7-f571d3cdcdd9" xlink:to="loc_us-gaap_VestingDomain_410820f7-5ca5-461b-93b7-f571d3cdcdd9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_c37712fe-b457-4348-9894-ceb093e19082" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_410820f7-5ca5-461b-93b7-f571d3cdcdd9" xlink:to="loc_us-gaap_VestingDomain_c37712fe-b457-4348-9894-ceb093e19082" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_EndOfMeasurementPeriodVestingMember_536ac2d2-ff75-41a8-b4f0-3f2385530e4e" xlink:href="glpi-20210630.xsd#glpi_EndOfMeasurementPeriodVestingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_c37712fe-b457-4348-9894-ceb093e19082" xlink:to="loc_glpi_EndOfMeasurementPeriodVestingMember_536ac2d2-ff75-41a8-b4f0-3f2385530e4e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_7b0d81ba-21a0-4dab-884e-6518ab92af08" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9c56b427-c240-4b96-b5c5-15872f0c8dbb" xlink:to="loc_us-gaap_AwardTypeAxis_7b0d81ba-21a0-4dab-884e-6518ab92af08" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7b0d81ba-21a0-4dab-884e-6518ab92af08_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_7b0d81ba-21a0-4dab-884e-6518ab92af08" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7b0d81ba-21a0-4dab-884e-6518ab92af08_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_248d30ce-0633-4830-a46b-072aa719ebe8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_7b0d81ba-21a0-4dab-884e-6518ab92af08" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_248d30ce-0633-4830-a46b-072aa719ebe8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_fb85ee5c-0f26-458e-adca-ebdd1be9f442" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_248d30ce-0633-4830-a46b-072aa719ebe8" xlink:to="loc_us-gaap_RestrictedStockMember_fb85ee5c-0f26-458e-adca-ebdd1be9f442" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_ba605b9b-5021-4c32-9618-06dbae42a756" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_248d30ce-0633-4830-a46b-072aa719ebe8" xlink:to="loc_us-gaap_PerformanceSharesMember_ba605b9b-5021-4c32-9618-06dbae42a756" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.glpropinc.com/role/StockBasedCompensationStockBasedCompensationRestrictedStockActivityDetails" xlink:type="simple" xlink:href="glpi-20210630.xsd#StockBasedCompensationStockBasedCompensationRestrictedStockActivityDetails"/>
  <link:definitionLink xlink:role="http://www.glpropinc.com/role/StockBasedCompensationStockBasedCompensationRestrictedStockActivityDetails" xlink:type="extended" id="i25e23fed164b42f6b0f568ce3b73508e_StockBasedCompensationStockBasedCompensationRestrictedStockActivityDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0523e1db-8413-4ccb-b068-e25517e6dae0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_6f96cb11-4d84-47db-bad3-46cd593c2ae2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0523e1db-8413-4ccb-b068-e25517e6dae0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_6f96cb11-4d84-47db-bad3-46cd593c2ae2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted_96181ca2-5221-404c-96e8-ce915b17120b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0523e1db-8413-4ccb-b068-e25517e6dae0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted_96181ca2-5221-404c-96e8-ce915b17120b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_b92265e3-3720-4014-8119-033fbe35da8f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0523e1db-8413-4ccb-b068-e25517e6dae0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_b92265e3-3720-4014-8119-033fbe35da8f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures_d1f06237-247d-4ac9-b3e8-c84d35c6b92b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0523e1db-8413-4ccb-b068-e25517e6dae0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures_d1f06237-247d-4ac9-b3e8-c84d35c6b92b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_16305293-07b0-4839-b3e0-f69789550f34" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_47cc63d9-abe8-4410-a389-71bcb9bfe15e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0523e1db-8413-4ccb-b068-e25517e6dae0" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_47cc63d9-abe8-4410-a389-71bcb9bfe15e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_bb39936b-1084-4843-bae2-ebaa6798d06e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_47cc63d9-abe8-4410-a389-71bcb9bfe15e" xlink:to="loc_us-gaap_AwardTypeAxis_bb39936b-1084-4843-bae2-ebaa6798d06e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bb39936b-1084-4843-bae2-ebaa6798d06e_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_bb39936b-1084-4843-bae2-ebaa6798d06e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bb39936b-1084-4843-bae2-ebaa6798d06e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7c508c71-c028-47a8-913d-0f816e8ee897" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_bb39936b-1084-4843-bae2-ebaa6798d06e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7c508c71-c028-47a8-913d-0f816e8ee897" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_40afd433-b59b-4864-9a0f-99a2e4ed49d3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7c508c71-c028-47a8-913d-0f816e8ee897" xlink:to="loc_us-gaap_RestrictedStockMember_40afd433-b59b-4864-9a0f-99a2e4ed49d3" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.glpropinc.com/role/StockBasedCompensationStockBasedCompensationPerformanceBasedAwardsDetails" xlink:type="simple" xlink:href="glpi-20210630.xsd#StockBasedCompensationStockBasedCompensationPerformanceBasedAwardsDetails"/>
  <link:definitionLink xlink:role="http://www.glpropinc.com/role/StockBasedCompensationStockBasedCompensationPerformanceBasedAwardsDetails" xlink:type="extended" id="i2dbbc9b435564222a60d80cafd0decdc_StockBasedCompensationStockBasedCompensationPerformanceBasedAwardsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_00d4e4c3-1ce6-42d1-9274-39c6905387b4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_94e8dc61-26b8-423d-9eba-b5cc98de7d9e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_00d4e4c3-1ce6-42d1-9274-39c6905387b4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_94e8dc61-26b8-423d-9eba-b5cc98de7d9e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_b08e6f7d-5ad6-4d5e-87a6-72aedf93d8ea" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_94e8dc61-26b8-423d-9eba-b5cc98de7d9e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_b08e6f7d-5ad6-4d5e-87a6-72aedf93d8ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted_06dbf152-a5e7-4075-a571-1e7016d29a3f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_94e8dc61-26b8-423d-9eba-b5cc98de7d9e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted_06dbf152-a5e7-4075-a571-1e7016d29a3f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_222404ab-8535-4a65-be82-09bd82f316ce" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_94e8dc61-26b8-423d-9eba-b5cc98de7d9e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_222404ab-8535-4a65-be82-09bd82f316ce" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures_8a026960-07a0-4cf2-816a-f68e8c0d04cc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_94e8dc61-26b8-423d-9eba-b5cc98de7d9e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures_8a026960-07a0-4cf2-816a-f68e8c0d04cc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_32116bda-6e97-4aa8-b137-b5523037ddc0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_841e5c1e-acc7-4db7-beee-34a2f4ccd82d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_00d4e4c3-1ce6-42d1-9274-39c6905387b4" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_841e5c1e-acc7-4db7-beee-34a2f4ccd82d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_6f39ade7-9d46-456b-82ce-09e4e5ed61dc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_841e5c1e-acc7-4db7-beee-34a2f4ccd82d" xlink:to="loc_us-gaap_AwardTypeAxis_6f39ade7-9d46-456b-82ce-09e4e5ed61dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6f39ade7-9d46-456b-82ce-09e4e5ed61dc_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_6f39ade7-9d46-456b-82ce-09e4e5ed61dc" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6f39ade7-9d46-456b-82ce-09e4e5ed61dc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bb7421a0-c6dd-44c3-ad30-79623dd18aad" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_6f39ade7-9d46-456b-82ce-09e4e5ed61dc" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bb7421a0-c6dd-44c3-ad30-79623dd18aad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_c8d67920-aa01-453c-bc55-9f6548f61150" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bb7421a0-c6dd-44c3-ad30-79623dd18aad" xlink:to="loc_us-gaap_PerformanceSharesMember_c8d67920-aa01-453c-bc55-9f6548f61150" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.glpropinc.com/role/SegmentInformationDetails" xlink:type="simple" xlink:href="glpi-20210630.xsd#SegmentInformationDetails"/>
  <link:definitionLink xlink:role="http://www.glpropinc.com/role/SegmentInformationDetails" xlink:type="extended" id="if2235f8247e2492c82df89dec58e2c97_SegmentInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_712178c8-1794-4ba0-b713-01e1e9d7421c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_aac6900e-9328-4ebf-b66b-8ba3cf6fe4ab" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_712178c8-1794-4ba0-b713-01e1e9d7421c" xlink:to="loc_us-gaap_NumberOfReportableSegments_aac6900e-9328-4ebf-b66b-8ba3cf6fe4ab" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_9ce254bf-3da8-4ea8-a7e9-5374fecd3785" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_712178c8-1794-4ba0-b713-01e1e9d7421c" xlink:to="loc_us-gaap_Revenues_9ce254bf-3da8-4ea8-a7e9-5374fecd3785" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_06b1dfdd-0c39-4356-a67f-3e0c73b685a1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_712178c8-1794-4ba0-b713-01e1e9d7421c" xlink:to="loc_us-gaap_OperatingIncomeLoss_06b1dfdd-0c39-4356-a67f-3e0c73b685a1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_f5fa7a7f-3343-4c63-be6b-9690d3a93bd7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_712178c8-1794-4ba0-b713-01e1e9d7421c" xlink:to="loc_us-gaap_InterestExpense_f5fa7a7f-3343-4c63-be6b-9690d3a93bd7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_4da83c63-0ed9-4057-9905-d49669ae4729" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_712178c8-1794-4ba0-b713-01e1e9d7421c" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_4da83c63-0ed9-4057-9905-d49669ae4729" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_aff19476-7a08-4446-9a0a-2aa0d4748950" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_712178c8-1794-4ba0-b713-01e1e9d7421c" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_aff19476-7a08-4446-9a0a-2aa0d4748950" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_37f4ce61-bee4-457f-b2df-895e8ec84d17" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_712178c8-1794-4ba0-b713-01e1e9d7421c" xlink:to="loc_us-gaap_NetIncomeLoss_37f4ce61-bee4-457f-b2df-895e8ec84d17" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_a736ba10-ec82-4bf9-871b-6b4e07f4843a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Depreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_712178c8-1794-4ba0-b713-01e1e9d7421c" xlink:to="loc_us-gaap_Depreciation_a736ba10-ec82-4bf9-871b-6b4e07f4843a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireProductiveAssets_aec74435-d1ea-4f02-895d-7ccedba30af9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireProductiveAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_712178c8-1794-4ba0-b713-01e1e9d7421c" xlink:to="loc_us-gaap_PaymentsToAcquireProductiveAssets_aec74435-d1ea-4f02-895d-7ccedba30af9" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForCapitalImprovements_66c01ade-3b2c-4dbe-8bd5-d742515e8beb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForCapitalImprovements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_712178c8-1794-4ba0-b713-01e1e9d7421c" xlink:to="loc_us-gaap_PaymentsForCapitalImprovements_66c01ade-3b2c-4dbe-8bd5-d742515e8beb" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_c27619a6-e43a-4073-94ce-5d675fc52d8b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_712178c8-1794-4ba0-b713-01e1e9d7421c" xlink:to="loc_us-gaap_Assets_c27619a6-e43a-4073-94ce-5d675fc52d8b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_ff4702fa-a452-46aa-ab75-eada22881d52" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_712178c8-1794-4ba0-b713-01e1e9d7421c" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_ff4702fa-a452-46aa-ab75-eada22881d52" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_95e973ea-a79f-46bc-a5b5-d6557b036db8" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_ff4702fa-a452-46aa-ab75-eada22881d52" xlink:to="loc_srt_ConsolidationItemsAxis_95e973ea-a79f-46bc-a5b5-d6557b036db8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_95e973ea-a79f-46bc-a5b5-d6557b036db8_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_95e973ea-a79f-46bc-a5b5-d6557b036db8" xlink:to="loc_srt_ConsolidationItemsDomain_95e973ea-a79f-46bc-a5b5-d6557b036db8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_3d3cc598-4552-41c3-a877-74f83e88d8aa" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_95e973ea-a79f-46bc-a5b5-d6557b036db8" xlink:to="loc_srt_ConsolidationItemsDomain_3d3cc598-4552-41c3-a877-74f83e88d8aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_522dab67-bfae-43e6-bc90-e5d7da1e36e5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_3d3cc598-4552-41c3-a877-74f83e88d8aa" xlink:to="loc_us-gaap_IntersegmentEliminationMember_522dab67-bfae-43e6-bc90-e5d7da1e36e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_22b61258-260f-454d-8085-e58fe9e3b039" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_ff4702fa-a452-46aa-ab75-eada22881d52" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_22b61258-260f-454d-8085-e58fe9e3b039" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_22b61258-260f-454d-8085-e58fe9e3b039_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_22b61258-260f-454d-8085-e58fe9e3b039" xlink:to="loc_us-gaap_SegmentDomain_22b61258-260f-454d-8085-e58fe9e3b039_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_95bd250d-2920-4b8b-8a12-a9466be76ad2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_22b61258-260f-454d-8085-e58fe9e3b039" xlink:to="loc_us-gaap_SegmentDomain_95bd250d-2920-4b8b-8a12-a9466be76ad2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_GLPCapitalLPMember_73d855f1-9411-4305-bc8f-0cfa8ddc9210" xlink:href="glpi-20210630.xsd#glpi_GLPCapitalLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_95bd250d-2920-4b8b-8a12-a9466be76ad2" xlink:to="loc_glpi_GLPCapitalLPMember_73d855f1-9411-4305-bc8f-0cfa8ddc9210" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_TRSPropertiesMember_b9e6d251-e479-4c32-adbd-24fdb9ef5b1a" xlink:href="glpi-20210630.xsd#glpi_TRSPropertiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_95bd250d-2920-4b8b-8a12-a9466be76ad2" xlink:to="loc_glpi_TRSPropertiesMember_b9e6d251-e479-4c32-adbd-24fdb9ef5b1a" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.glpropinc.com/role/AcquisitionsDetails" xlink:type="simple" xlink:href="glpi-20210630.xsd#AcquisitionsDetails"/>
  <link:definitionLink xlink:role="http://www.glpropinc.com/role/AcquisitionsDetails" xlink:type="extended" id="i1e550ad3847449f587527110c4540c42_AcquisitionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_0e5cd2a2-d9ec-457e-84a9-dec49ec833ea" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRealEstateInvestments_e1797e2c-dbde-4c7d-88dc-cdba580505b5" xlink:href="glpi-20210630.xsd#glpi_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRealEstateInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_0e5cd2a2-d9ec-457e-84a9-dec49ec833ea" xlink:to="loc_glpi_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRealEstateInvestments_e1797e2c-dbde-4c7d-88dc-cdba580505b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRightOfUseAssetsAndLandRights_8eba88ee-e1cd-4c94-8ec2-cda93b162cb7" xlink:href="glpi-20210630.xsd#glpi_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRightOfUseAssetsAndLandRights"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_0e5cd2a2-d9ec-457e-84a9-dec49ec833ea" xlink:to="loc_glpi_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRightOfUseAssetsAndLandRights_8eba88ee-e1cd-4c94-8ec2-cda93b162cb7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireProductiveAssets_608c3442-5b07-42c0-b53c-eddf6aaf88ef" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireProductiveAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_0e5cd2a2-d9ec-457e-84a9-dec49ec833ea" xlink:to="loc_us-gaap_PaymentsToAcquireProductiveAssets_608c3442-5b07-42c0-b53c-eddf6aaf88ef" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_PaymentstoAcquireRealEstateExcludingTransactionCosts_667ea9db-1dde-40fd-b47b-07217c7d881c" xlink:href="glpi-20210630.xsd#glpi_PaymentstoAcquireRealEstateExcludingTransactionCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_0e5cd2a2-d9ec-457e-84a9-dec49ec833ea" xlink:to="loc_glpi_PaymentstoAcquireRealEstateExcludingTransactionCosts_667ea9db-1dde-40fd-b47b-07217c7d881c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_LessorOperatingLeaseAnnualPaymentsToBeReceived_bb5c7a6c-4c29-4a57-a50d-81c7281e0514" xlink:href="glpi-20210630.xsd#glpi_LessorOperatingLeaseAnnualPaymentsToBeReceived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_0e5cd2a2-d9ec-457e-84a9-dec49ec833ea" xlink:to="loc_glpi_LessorOperatingLeaseAnnualPaymentsToBeReceived_bb5c7a6c-4c29-4a57-a50d-81c7281e0514" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_SaleLeasebackTransactionTerm_448ff5a1-2d20-41da-8823-33065fcfca52" xlink:href="glpi-20210630.xsd#glpi_SaleLeasebackTransactionTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_0e5cd2a2-d9ec-457e-84a9-dec49ec833ea" xlink:to="loc_glpi_SaleLeasebackTransactionTerm_448ff5a1-2d20-41da-8823-33065fcfca52" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_4c524b74-d857-4077-99d5-18e855b766e9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_0e5cd2a2-d9ec-457e-84a9-dec49ec833ea" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_4c524b74-d857-4077-99d5-18e855b766e9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeaseTermOfContract_c7991557-fc74-4820-b02c-fd1dadcad4c5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LessorOperatingLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_0e5cd2a2-d9ec-457e-84a9-dec49ec833ea" xlink:to="loc_us-gaap_LessorOperatingLeaseTermOfContract_c7991557-fc74-4820-b02c-fd1dadcad4c5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_LessorOperatingLeaseTotalRentToBeReceived_5f44f119-0834-4621-b56c-e236a656f6cb" xlink:href="glpi-20210630.xsd#glpi_LessorOperatingLeaseTotalRentToBeReceived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_0e5cd2a2-d9ec-457e-84a9-dec49ec833ea" xlink:to="loc_glpi_LessorOperatingLeaseTotalRentToBeReceived_5f44f119-0834-4621-b56c-e236a656f6cb" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_ffef616a-0ba8-41d5-87ec-a59a84d39acc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_0e5cd2a2-d9ec-457e-84a9-dec49ec833ea" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_ffef616a-0ba8-41d5-87ec-a59a84d39acc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_0ed11138-aff1-4d0b-bde1-b57587b4d85b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_ffef616a-0ba8-41d5-87ec-a59a84d39acc" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_0ed11138-aff1-4d0b-bde1-b57587b4d85b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0ed11138-aff1-4d0b-bde1-b57587b4d85b_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_0ed11138-aff1-4d0b-bde1-b57587b4d85b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0ed11138-aff1-4d0b-bde1-b57587b4d85b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e184284d-5c50-420f-877e-7bfb0f6040b3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_0ed11138-aff1-4d0b-bde1-b57587b4d85b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e184284d-5c50-420f-877e-7bfb0f6040b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_BallysTropicanaEvansvilleDoverDownsMember_f6fd5081-de34-4543-9df3-fc61da4f9e18" xlink:href="glpi-20210630.xsd#glpi_BallysTropicanaEvansvilleDoverDownsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e184284d-5c50-420f-877e-7bfb0f6040b3" xlink:to="loc_glpi_BallysTropicanaEvansvilleDoverDownsMember_f6fd5081-de34-4543-9df3-fc61da4f9e18" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_TwinRiverWorldwideHoldingsIncMember_50f34edf-5a04-48e5-8d14-a89280033aa5" xlink:href="glpi-20210630.xsd#glpi_TwinRiverWorldwideHoldingsIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e184284d-5c50-420f-877e-7bfb0f6040b3" xlink:to="loc_glpi_TwinRiverWorldwideHoldingsIncMember_50f34edf-5a04-48e5-8d14-a89280033aa5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermAxis_81c48b34-d119-49a0-abd5-130324c21bc6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseContractualTermAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_ffef616a-0ba8-41d5-87ec-a59a84d39acc" xlink:to="loc_us-gaap_LeaseContractualTermAxis_81c48b34-d119-49a0-abd5-130324c21bc6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_81c48b34-d119-49a0-abd5-130324c21bc6_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LeaseContractualTermAxis_81c48b34-d119-49a0-abd5-130324c21bc6" xlink:to="loc_us-gaap_LeaseContractualTermDomain_81c48b34-d119-49a0-abd5-130324c21bc6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_a54bb072-6676-4ade-8655-b0de35673482" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LeaseContractualTermAxis_81c48b34-d119-49a0-abd5-130324c21bc6" xlink:to="loc_us-gaap_LeaseContractualTermDomain_a54bb072-6676-4ade-8655-b0de35673482" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_glpi_TwinRiverMasterLeaseMember_c26f0205-c015-4532-b28f-148629c732f3" xlink:href="glpi-20210630.xsd#glpi_TwinRiverMasterLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_a54bb072-6676-4ade-8655-b0de35673482" xlink:to="loc_glpi_TwinRiverMasterLeaseMember_c26f0205-c015-4532-b28f-148629c732f3" xlink:type="arc" order="0"/>
  </link:definitionLink>
</link:linkbase>
