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

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2023 Workiva-->
<!--r:b6c98e01-01f1-4b92-a5dc-13802668e500,g:369f1bd0-136b-4c1b-99d5-bbb17a09f4a1-->
<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.brightspire.com/role/DocumentandEntityInformation" xlink:type="simple" xlink:href="brsp-20230221.xsd#DocumentandEntityInformation"/>
  <link:definitionLink xlink:role="http://www.brightspire.com/role/DocumentandEntityInformation" xlink:type="extended" id="i7873a608fc3f4b20addc011bdc4f7f49_DocumentandEntityInformation">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_4f7e18eb-53e4-479c-8fc5-c523f2dc972b" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_b1b53176-cf34-40fe-91cc-362313a5eb01" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_4f7e18eb-53e4-479c-8fc5-c523f2dc972b" xlink:to="loc_dei_EntityRegistrantName_b1b53176-cf34-40fe-91cc-362313a5eb01" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_0bfcd20f-8b22-46fe-834e-b4ad9eed0e8c" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_4f7e18eb-53e4-479c-8fc5-c523f2dc972b" xlink:to="loc_dei_DocumentType_0bfcd20f-8b22-46fe-834e-b4ad9eed0e8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_6538c5d6-df24-4bd2-8f22-ff3cf492b6b2" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_4f7e18eb-53e4-479c-8fc5-c523f2dc972b" xlink:to="loc_dei_DocumentPeriodEndDate_6538c5d6-df24-4bd2-8f22-ff3cf492b6b2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_f3edd14e-3f12-4370-a814-3b5b65afe5e1" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityRegistrantName"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_ab234f50-9224-410d-857f-95e0ce89e92b" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_4f7e18eb-53e4-479c-8fc5-c523f2dc972b" xlink:to="loc_dei_EntityCentralIndexKey_ab234f50-9224-410d-857f-95e0ce89e92b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_0987b29b-74b4-4602-aa11-a5d03a178fe4" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_4f7e18eb-53e4-479c-8fc5-c523f2dc972b" xlink:to="loc_dei_AmendmentFlag_0987b29b-74b4-4602-aa11-a5d03a178fe4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_46d2f3c9-5cf4-4038-b3aa-2c5f879936ef" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_4f7e18eb-53e4-479c-8fc5-c523f2dc972b" xlink:to="loc_dei_EntityIncorporationStateCountryCode_46d2f3c9-5cf4-4038-b3aa-2c5f879936ef" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_49399f88-24fd-4b89-bdbd-1a558031edc6" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_4f7e18eb-53e4-479c-8fc5-c523f2dc972b" xlink:to="loc_dei_EntityFileNumber_49399f88-24fd-4b89-bdbd-1a558031edc6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_02b20930-ee5c-42a5-a5f2-3e9dea834777" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_4f7e18eb-53e4-479c-8fc5-c523f2dc972b" xlink:to="loc_dei_EntityTaxIdentificationNumber_02b20930-ee5c-42a5-a5f2-3e9dea834777" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_5c4a529c-87c5-4be9-98d7-cf58ab189b52" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_4f7e18eb-53e4-479c-8fc5-c523f2dc972b" xlink:to="loc_dei_EntityAddressAddressLine1_5c4a529c-87c5-4be9-98d7-cf58ab189b52" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_6e1f44f6-84d8-4906-b273-38464dcb74b1" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityAddressAddressLine2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_4f7e18eb-53e4-479c-8fc5-c523f2dc972b" xlink:to="loc_dei_EntityAddressAddressLine2_6e1f44f6-84d8-4906-b273-38464dcb74b1" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_cc837717-0e16-4a18-b51e-4082be6ca0e3" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_4f7e18eb-53e4-479c-8fc5-c523f2dc972b" xlink:to="loc_dei_EntityAddressCityOrTown_cc837717-0e16-4a18-b51e-4082be6ca0e3" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_574852b3-77ee-4bb4-9a11-66b3b0079f6b" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_4f7e18eb-53e4-479c-8fc5-c523f2dc972b" xlink:to="loc_dei_EntityAddressStateOrProvince_574852b3-77ee-4bb4-9a11-66b3b0079f6b" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_3da4b214-fad5-4121-91b9-985f698b507a" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_4f7e18eb-53e4-479c-8fc5-c523f2dc972b" xlink:to="loc_dei_EntityAddressPostalZipCode_3da4b214-fad5-4121-91b9-985f698b507a" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_93121579-ddb9-445e-a1fa-2253cd597faf" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_4f7e18eb-53e4-479c-8fc5-c523f2dc972b" xlink:to="loc_dei_CityAreaCode_93121579-ddb9-445e-a1fa-2253cd597faf" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_63da87bd-6bd5-473b-9a05-6261919cb234" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_4f7e18eb-53e4-479c-8fc5-c523f2dc972b" xlink:to="loc_dei_LocalPhoneNumber_63da87bd-6bd5-473b-9a05-6261919cb234" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_c92c45f7-8057-415a-be6d-69da15448f59" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_WrittenCommunications"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_4f7e18eb-53e4-479c-8fc5-c523f2dc972b" xlink:to="loc_dei_WrittenCommunications_c92c45f7-8057-415a-be6d-69da15448f59" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_7556afd7-1012-4591-8d2e-47c025e8e8f9" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_SolicitingMaterial"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_4f7e18eb-53e4-479c-8fc5-c523f2dc972b" xlink:to="loc_dei_SolicitingMaterial_7556afd7-1012-4591-8d2e-47c025e8e8f9" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_cb9c8f6b-e04a-4b7e-ba4a-5990bd20eaa1" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_PreCommencementTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_4f7e18eb-53e4-479c-8fc5-c523f2dc972b" xlink:to="loc_dei_PreCommencementTenderOffer_cb9c8f6b-e04a-4b7e-ba4a-5990bd20eaa1" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_e0ae21a9-9814-4b8f-9d49-bd4f9bb68fe8" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_4f7e18eb-53e4-479c-8fc5-c523f2dc972b" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_e0ae21a9-9814-4b8f-9d49-bd4f9bb68fe8" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_d514ec23-0106-4909-88d1-200e2581adcf" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_4f7e18eb-53e4-479c-8fc5-c523f2dc972b" xlink:to="loc_dei_Security12bTitle_d514ec23-0106-4909-88d1-200e2581adcf" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_fddae0cb-8ee6-4eeb-89ab-999661d3c561" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_4f7e18eb-53e4-479c-8fc5-c523f2dc972b" xlink:to="loc_dei_TradingSymbol_fddae0cb-8ee6-4eeb-89ab-999661d3c561" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_aec8c17d-f676-4c09-ba15-c3c4c3b8afb9" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_4f7e18eb-53e4-479c-8fc5-c523f2dc972b" xlink:to="loc_dei_SecurityExchangeName_aec8c17d-f676-4c09-ba15-c3c4c3b8afb9" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_31df63cd-b2a2-4507-bc0c-15fb3b62f895" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_4f7e18eb-53e4-479c-8fc5-c523f2dc972b" xlink:to="loc_dei_EntityEmergingGrowthCompany_31df63cd-b2a2-4507-bc0c-15fb3b62f895" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_1aebf30b-1de4-41ed-81f9-8fb21866f42f" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_4f7e18eb-53e4-479c-8fc5-c523f2dc972b" xlink:to="loc_dei_DocumentInformationTable_1aebf30b-1de4-41ed-81f9-8fb21866f42f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressesAddressTypeAxis_555e3787-bcbf-4ae6-8ec1-dec0a86c2ada" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityAddressesAddressTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_1aebf30b-1de4-41ed-81f9-8fb21866f42f" xlink:to="loc_dei_EntityAddressesAddressTypeAxis_555e3787-bcbf-4ae6-8ec1-dec0a86c2ada" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AddressTypeDomain_555e3787-bcbf-4ae6-8ec1-dec0a86c2ada_default" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_AddressTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_EntityAddressesAddressTypeAxis_555e3787-bcbf-4ae6-8ec1-dec0a86c2ada" xlink:to="loc_dei_AddressTypeDomain_555e3787-bcbf-4ae6-8ec1-dec0a86c2ada_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AddressTypeDomain_b3369288-78a7-4dd2-9201-28a04cbcecea" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_AddressTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_EntityAddressesAddressTypeAxis_555e3787-bcbf-4ae6-8ec1-dec0a86c2ada" xlink:to="loc_dei_AddressTypeDomain_b3369288-78a7-4dd2-9201-28a04cbcecea" xlink:type="arc" order="1"/>
  </link:definitionLink>
</link:linkbase>
