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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:699f3715-f978-49d7-abf7-48d06c79b62e,g:8f5507eb-794b-4e93-9ff4-54e9fd89386f-->
<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.lpcorp.com/role/CoverPage" xlink:type="simple" xlink:href="lpx-20250630.xsd#CoverPage"/>
  <link:definitionLink xlink:role="http://www.lpcorp.com/role/CoverPage" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_51fde9d4-676d-4fcc-b1da-5e4da5a4b5d3" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_EntitiesTable_51fde9d4-676d-4fcc-b1da-5e4da5a4b5d3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_b78e17bf-4cce-4a93-aa24-a7bfd0fa293f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_51fde9d4-676d-4fcc-b1da-5e4da5a4b5d3" xlink:to="loc_dei_LegalEntityAxis_b78e17bf-4cce-4a93-aa24-a7bfd0fa293f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_b78e17bf-4cce-4a93-aa24-a7bfd0fa293f_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_b78e17bf-4cce-4a93-aa24-a7bfd0fa293f" xlink:to="loc_dei_EntityDomain_b78e17bf-4cce-4a93-aa24-a7bfd0fa293f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_a1461e86-35cd-4c71-b568-8f18f1e874f9" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_b78e17bf-4cce-4a93-aa24-a7bfd0fa293f" xlink:to="loc_dei_EntityDomain_a1461e86-35cd-4c71-b568-8f18f1e874f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_2975851a-c4a6-4b24-b3fb-291152aad01f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_EntityIncorporationStateCountryCode_2975851a-c4a6-4b24-b3fb-291152aad01f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_8b5f39e2-7d55-48e3-9c73-cbfe2dcd78d6" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_Security12bTitle_8b5f39e2-7d55-48e3-9c73-cbfe2dcd78d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_c71a6153-8085-4755-8b09-78c9c0e27a52" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_EntityTaxIdentificationNumber_c71a6153-8085-4755-8b09-78c9c0e27a52" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_19f46598-4c56-43ef-b4a9-0c4b6e1e9037" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_TradingSymbol_19f46598-4c56-43ef-b4a9-0c4b6e1e9037" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_65f2a07f-7dc9-4403-b7e2-ee4ed96e1863" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_EntityRegistrantName_65f2a07f-7dc9-4403-b7e2-ee4ed96e1863" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_f1e51958-47f9-4d68-996f-63d74397d44b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_EntityAddressAddressLine1_f1e51958-47f9-4d68-996f-63d74397d44b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_7b242ef4-4db9-4ece-a3af-d71f107c1e45" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_EntityAddressAddressLine2_7b242ef4-4db9-4ece-a3af-d71f107c1e45" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_af35a6f0-0fbc-47aa-be0e-18de693c520c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_EntityAddressCityOrTown_af35a6f0-0fbc-47aa-be0e-18de693c520c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_3623d9be-b57c-44f5-bf72-68fefa0b784a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_EntityAddressStateOrProvince_3623d9be-b57c-44f5-bf72-68fefa0b784a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_4b03256a-763f-41b0-9060-1911d082ac1a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_EntityAddressPostalZipCode_4b03256a-763f-41b0-9060-1911d082ac1a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_538fb545-f092-4d0c-837c-a418bd27f8d3" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_CityAreaCode_538fb545-f092-4d0c-837c-a418bd27f8d3" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_19eec69d-253f-43cb-9410-0e0fa58f10a7" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_LocalPhoneNumber_19eec69d-253f-43cb-9410-0e0fa58f10a7" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_87ff1603-3503-4c1e-be47-23452ff68da8" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_EntityCentralIndexKey_87ff1603-3503-4c1e-be47-23452ff68da8" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_b64a2a82-0f3f-48c2-893c-2d2f8dc12d20" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_CurrentFiscalYearEndDate_b64a2a82-0f3f-48c2-893c-2d2f8dc12d20" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_5368c9d7-2cbc-41a4-8781-463cd7283046" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_DocumentType_5368c9d7-2cbc-41a4-8781-463cd7283046" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_0191db18-e09a-42c5-a398-b80120439576" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_DocumentPeriodEndDate_0191db18-e09a-42c5-a398-b80120439576" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_edbde4ed-34c1-44c4-9866-11d17017265f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_EntityFileNumber_edbde4ed-34c1-44c4-9866-11d17017265f" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_1ceebcfc-8e3d-4dbb-b2cb-a660032394fe" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_DocumentFiscalYearFocus_1ceebcfc-8e3d-4dbb-b2cb-a660032394fe" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_52e4edcc-bce3-45bb-b8f5-290f7d0e2f87" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_DocumentFiscalPeriodFocus_52e4edcc-bce3-45bb-b8f5-290f7d0e2f87" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_b6944a6b-6371-4001-9411-4d7b60b6245a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_AmendmentFlag_b6944a6b-6371-4001-9411-4d7b60b6245a" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_4a2ccdf1-3158-4cf4-846f-a02e229f3fd1" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentQuarterlyReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_DocumentQuarterlyReport_4a2ccdf1-3158-4cf4-846f-a02e229f3fd1" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_0153ce9c-6681-4466-aba6-08fccf7d04d1" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_DocumentTransitionReport_0153ce9c-6681-4466-aba6-08fccf7d04d1" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_c1bb0fec-739d-4114-bd66-907ba2db6440" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_EntityInteractiveDataCurrent_c1bb0fec-739d-4114-bd66-907ba2db6440" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_c05a6949-1279-426b-9aaa-f51fa0c19b6c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_c05a6949-1279-426b-9aaa-f51fa0c19b6c" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_ec3fae25-2f3d-4968-a8f7-992fc64d5f52" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_SecurityExchangeName_ec3fae25-2f3d-4968-a8f7-992fc64d5f52" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_4dac5a0e-78ea-4988-9c9e-59a8459fdc01" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_EntityFilerCategory_4dac5a0e-78ea-4988-9c9e-59a8459fdc01" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_73de9042-f8e1-46cd-bdc2-f68ef79e517c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_EntityShellCompany_73de9042-f8e1-46cd-bdc2-f68ef79e517c" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_4635fe68-597e-488a-a3cb-d7da50f89a7f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_EntityEmergingGrowthCompany_4635fe68-597e-488a-a3cb-d7da50f89a7f" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_9e023266-f6b4-4dc7-a011-e39e9c7244fc" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntitySmallBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_EntitySmallBusiness_9e023266-f6b4-4dc7-a011-e39e9c7244fc" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_8041446f-6368-4011-8396-817bc5dafbd8" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_1ac55989-e5e1-4ed1-aac7-5f3168b4311a" xlink:to="loc_dei_EntityCurrentReportingStatus_8041446f-6368-4011-8396-817bc5dafbd8" xlink:type="arc" order="29"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lpcorp.com/role/CondensedConsolidatedStatementsofComprehensiveIncome" xlink:type="simple" xlink:href="lpx-20250630.xsd#CondensedConsolidatedStatementsofComprehensiveIncome"/>
  <link:definitionLink xlink:role="http://www.lpcorp.com/role/CondensedConsolidatedStatementsofComprehensiveIncome" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_9cce34f1-65a9-4651-a022-ca8d5032b93a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_3713c9e6-648b-4fd5-ba9f-a65ee8777841" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_9cce34f1-65a9-4651-a022-ca8d5032b93a" xlink:to="loc_us-gaap_StatementTable_3713c9e6-648b-4fd5-ba9f-a65ee8777841" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_12de23b1-2174-4a7f-9b33-35fa1e61d60a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_3713c9e6-648b-4fd5-ba9f-a65ee8777841" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_12de23b1-2174-4a7f-9b33-35fa1e61d60a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_12de23b1-2174-4a7f-9b33-35fa1e61d60a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_12de23b1-2174-4a7f-9b33-35fa1e61d60a" xlink:to="loc_us-gaap_EquityComponentDomain_12de23b1-2174-4a7f-9b33-35fa1e61d60a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_21408c97-dea8-48e6-8938-74eb15883f70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_12de23b1-2174-4a7f-9b33-35fa1e61d60a" xlink:to="loc_us-gaap_EquityComponentDomain_21408c97-dea8-48e6-8938-74eb15883f70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_d59c72ae-6350-4f87-aaaa-76f500fae499" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_21408c97-dea8-48e6-8938-74eb15883f70" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_d59c72ae-6350-4f87-aaaa-76f500fae499" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_bd6c9ff9-59e0-4eee-8fb8-6a257105602c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9cce34f1-65a9-4651-a022-ca8d5032b93a" xlink:to="loc_us-gaap_ProfitLoss_bd6c9ff9-59e0-4eee-8fb8-6a257105602c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_0c4fe336-2711-42f7-899b-f3a790487840" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9cce34f1-65a9-4651-a022-ca8d5032b93a" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_0c4fe336-2711-42f7-899b-f3a790487840" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_fb5d7f6e-d0e1-47d7-b50e-2f01eb88aaa3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_0c4fe336-2711-42f7-899b-f3a790487840" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_fb5d7f6e-d0e1-47d7-b50e-2f01eb88aaa3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_d43e10af-c99f-462a-bd4a-9763f17b0a42" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9cce34f1-65a9-4651-a022-ca8d5032b93a" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_d43e10af-c99f-462a-bd4a-9763f17b0a42" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lpcorp.com/role/CondensedConsolidatedStatementsofStockholdersEquity" xlink:type="simple" xlink:href="lpx-20250630.xsd#CondensedConsolidatedStatementsofStockholdersEquity"/>
  <link:definitionLink xlink:role="http://www.lpcorp.com/role/CondensedConsolidatedStatementsofStockholdersEquity" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_f2e699f0-aa10-4603-ac1a-8d61fe5e0f41" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_47134f2e-18f8-4314-b8f2-4f6f927f7e37" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_f2e699f0-aa10-4603-ac1a-8d61fe5e0f41" xlink:to="loc_us-gaap_StatementTable_47134f2e-18f8-4314-b8f2-4f6f927f7e37" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_aa2a8186-1073-408c-919f-b04f39a20d8d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_47134f2e-18f8-4314-b8f2-4f6f927f7e37" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_aa2a8186-1073-408c-919f-b04f39a20d8d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_aa2a8186-1073-408c-919f-b04f39a20d8d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_aa2a8186-1073-408c-919f-b04f39a20d8d" xlink:to="loc_us-gaap_EquityComponentDomain_aa2a8186-1073-408c-919f-b04f39a20d8d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_90b470ee-7935-4662-aa22-e4aef5037d08" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_aa2a8186-1073-408c-919f-b04f39a20d8d" xlink:to="loc_us-gaap_EquityComponentDomain_90b470ee-7935-4662-aa22-e4aef5037d08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_bfbf918e-75ea-4b28-819d-b3f695d7fde5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_90b470ee-7935-4662-aa22-e4aef5037d08" xlink:to="loc_us-gaap_CommonStockMember_bfbf918e-75ea-4b28-819d-b3f695d7fde5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_627416a6-57c7-4d62-9689-e3e344d67a32" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_90b470ee-7935-4662-aa22-e4aef5037d08" xlink:to="loc_us-gaap_TreasuryStockCommonMember_627416a6-57c7-4d62-9689-e3e344d67a32" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_1011e544-ef6a-4c3e-9c5d-eafa82c3860c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_90b470ee-7935-4662-aa22-e4aef5037d08" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_1011e544-ef6a-4c3e-9c5d-eafa82c3860c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_95150a56-2649-4143-be9f-25be12c67deb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_90b470ee-7935-4662-aa22-e4aef5037d08" xlink:to="loc_us-gaap_RetainedEarningsMember_95150a56-2649-4143-be9f-25be12c67deb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_db0d91fc-6502-44a8-8018-9245335b41ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_90b470ee-7935-4662-aa22-e4aef5037d08" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_db0d91fc-6502-44a8-8018-9245335b41ae" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f5ad5657-4cd1-4d17-96fd-c3f45ec60567" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_f2e699f0-aa10-4603-ac1a-8d61fe5e0f41" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f5ad5657-4cd1-4d17-96fd-c3f45ec60567" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_3392ceb5-0ea9-43a1-8c18-297afc7b4129" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f5ad5657-4cd1-4d17-96fd-c3f45ec60567" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_3392ceb5-0ea9-43a1-8c18-297afc7b4129" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_8aeb870f-208b-4c14-90cc-c53e910d4446" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f5ad5657-4cd1-4d17-96fd-c3f45ec60567" xlink:to="loc_us-gaap_TreasuryStockCommonShares_8aeb870f-208b-4c14-90cc-c53e910d4446" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_ef4f285d-6223-4e8a-9d8a-202b872d1281" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f5ad5657-4cd1-4d17-96fd-c3f45ec60567" xlink:to="loc_us-gaap_StockholdersEquity_ef4f285d-6223-4e8a-9d8a-202b872d1281" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_681fe8b3-09ee-46c4-a2df-6411dfd3d169" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f5ad5657-4cd1-4d17-96fd-c3f45ec60567" xlink:to="loc_us-gaap_NetIncomeLoss_681fe8b3-09ee-46c4-a2df-6411dfd3d169" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividends_123242d0-dd83-447b-a340-ea3f844dfad7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsOfDividends"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f5ad5657-4cd1-4d17-96fd-c3f45ec60567" xlink:to="loc_us-gaap_PaymentsOfDividends_123242d0-dd83-447b-a340-ea3f844dfad7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_d1911206-d4f8-424f-aeb5-82a40a52b329" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f5ad5657-4cd1-4d17-96fd-c3f45ec60567" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_d1911206-d4f8-424f-aeb5-82a40a52b329" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_09888ffd-7803-40fa-9c4a-099826b42d70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f5ad5657-4cd1-4d17-96fd-c3f45ec60567" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_09888ffd-7803-40fa-9c4a-099826b42d70" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_CommonstockSharesacquired_cfaf17ff-8ac4-4a1b-963e-697da17c1a3e" xlink:href="lpx-20250630.xsd#lpx_CommonstockSharesacquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f5ad5657-4cd1-4d17-96fd-c3f45ec60567" xlink:to="loc_lpx_CommonstockSharesacquired_cfaf17ff-8ac4-4a1b-963e-697da17c1a3e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_CommonstockValueSharesacquired_25e68b00-b39b-4133-b053-fa2ddd917d24" xlink:href="lpx-20250630.xsd#lpx_CommonstockValueSharesacquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f5ad5657-4cd1-4d17-96fd-c3f45ec60567" xlink:to="loc_lpx_CommonstockValueSharesacquired_25e68b00-b39b-4133-b053-fa2ddd917d24" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_bddccb70-cce3-4e6b-bda0-a25e9b67ea2d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f5ad5657-4cd1-4d17-96fd-c3f45ec60567" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_bddccb70-cce3-4e6b-bda0-a25e9b67ea2d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_39968ef1-1b77-496d-abd7-b18c839e8b23" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f5ad5657-4cd1-4d17-96fd-c3f45ec60567" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_39968ef1-1b77-496d-abd7-b18c839e8b23" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_80d56869-2059-42d0-b74b-8f7189aa8e5f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f5ad5657-4cd1-4d17-96fd-c3f45ec60567" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_80d56869-2059-42d0-b74b-8f7189aa8e5f" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_f5a54be7-efa5-43ea-8008-e10275696578" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_f569d48f-6466-4393-8c89-641875ff9c74" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_a2485b1a-d3d9-446b-9ded-52285b3e770a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lpcorp.com/role/RevenueDetails" xlink:type="simple" xlink:href="lpx-20250630.xsd#RevenueDetails"/>
  <link:definitionLink xlink:role="http://www.lpcorp.com/role/RevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_fad3ed0b-04d2-476c-935f-be4b12c53419" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_b161ff47-6c93-497b-a43a-6a8c6d51c56a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fad3ed0b-04d2-476c-935f-be4b12c53419" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_b161ff47-6c93-497b-a43a-6a8c6d51c56a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_ProducttypeAxis_d629be8f-ea61-48ec-a48e-4c5269838a30" xlink:href="lpx-20250630.xsd#lpx_ProducttypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_b161ff47-6c93-497b-a43a-6a8c6d51c56a" xlink:to="loc_lpx_ProducttypeAxis_d629be8f-ea61-48ec-a48e-4c5269838a30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_ProducttypeDomain_d629be8f-ea61-48ec-a48e-4c5269838a30_default" xlink:href="lpx-20250630.xsd#lpx_ProducttypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_lpx_ProducttypeAxis_d629be8f-ea61-48ec-a48e-4c5269838a30" xlink:to="loc_lpx_ProducttypeDomain_d629be8f-ea61-48ec-a48e-4c5269838a30_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_ProducttypeDomain_8b95cc3d-f266-48bd-b1eb-79a7b0c5edcc" xlink:href="lpx-20250630.xsd#lpx_ProducttypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_lpx_ProducttypeAxis_d629be8f-ea61-48ec-a48e-4c5269838a30" xlink:to="loc_lpx_ProducttypeDomain_8b95cc3d-f266-48bd-b1eb-79a7b0c5edcc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_ValueaddMember_fd3dc0f8-2ed0-432c-ad40-0648ca08e89a" xlink:href="lpx-20250630.xsd#lpx_ValueaddMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpx_ProducttypeDomain_8b95cc3d-f266-48bd-b1eb-79a7b0c5edcc" xlink:to="loc_lpx_ValueaddMember_fd3dc0f8-2ed0-432c-ad40-0648ca08e89a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_CommodityProductsMember_c827041f-e9ab-4d5d-9355-f262656fefad" xlink:href="lpx-20250630.xsd#lpx_CommodityProductsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpx_ProducttypeDomain_8b95cc3d-f266-48bd-b1eb-79a7b0c5edcc" xlink:to="loc_lpx_CommodityProductsMember_c827041f-e9ab-4d5d-9355-f262656fefad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_OtherProductTypesMember_be18fa81-ecfc-46fa-8930-eefae0de1269" xlink:href="lpx-20250630.xsd#lpx_OtherProductTypesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpx_ProducttypeDomain_8b95cc3d-f266-48bd-b1eb-79a7b0c5edcc" xlink:to="loc_lpx_OtherProductTypesMember_be18fa81-ecfc-46fa-8930-eefae0de1269" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_adbf35b1-7fea-4c92-af7a-2811ec252c7c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_b161ff47-6c93-497b-a43a-6a8c6d51c56a" xlink:to="loc_srt_ProductOrServiceAxis_adbf35b1-7fea-4c92-af7a-2811ec252c7c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_adbf35b1-7fea-4c92-af7a-2811ec252c7c_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_adbf35b1-7fea-4c92-af7a-2811ec252c7c" xlink:to="loc_srt_ProductsAndServicesDomain_adbf35b1-7fea-4c92-af7a-2811ec252c7c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_b2702805-44f2-41e9-be03-a54106bab9c8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_adbf35b1-7fea-4c92-af7a-2811ec252c7c" xlink:to="loc_srt_ProductsAndServicesDomain_b2702805-44f2-41e9-be03-a54106bab9c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_SmartSideStrandsidingMember_44651e75-d4be-4b5a-98aa-f6742f39f026" xlink:href="lpx-20250630.xsd#lpx_SmartSideStrandsidingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_b2702805-44f2-41e9-be03-a54106bab9c8" xlink:to="loc_lpx_SmartSideStrandsidingMember_44651e75-d4be-4b5a-98aa-f6742f39f026" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_OSBvalueaddMember_c84d37ac-ebf9-44c9-ab95-c0f47ed9b465" xlink:href="lpx-20250630.xsd#lpx_OSBvalueaddMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_b2702805-44f2-41e9-be03-a54106bab9c8" xlink:to="loc_lpx_OSBvalueaddMember_c84d37ac-ebf9-44c9-ab95-c0f47ed9b465" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_OSBcommodityMember_8b9fda63-27ed-452f-b32a-5054752e2a00" xlink:href="lpx-20250630.xsd#lpx_OSBcommodityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_b2702805-44f2-41e9-be03-a54106bab9c8" xlink:to="loc_lpx_OSBcommodityMember_8b9fda63-27ed-452f-b32a-5054752e2a00" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_OtherproductsMember_bd998ecf-c4c5-4dc3-b01d-e32e19a3c485" xlink:href="lpx-20250630.xsd#lpx_OtherproductsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_b2702805-44f2-41e9-be03-a54106bab9c8" xlink:to="loc_lpx_OtherproductsMember_bd998ecf-c4c5-4dc3-b01d-e32e19a3c485" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_273d3eab-b7e9-4ab6-8cb9-45cd465a3dd8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_b161ff47-6c93-497b-a43a-6a8c6d51c56a" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_273d3eab-b7e9-4ab6-8cb9-45cd465a3dd8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_273d3eab-b7e9-4ab6-8cb9-45cd465a3dd8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_273d3eab-b7e9-4ab6-8cb9-45cd465a3dd8" xlink:to="loc_us-gaap_SegmentDomain_273d3eab-b7e9-4ab6-8cb9-45cd465a3dd8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_d410afc2-5f9a-4322-b346-858d11df530f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_273d3eab-b7e9-4ab6-8cb9-45cd465a3dd8" xlink:to="loc_us-gaap_SegmentDomain_d410afc2-5f9a-4322-b346-858d11df530f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_SidingSegmentMember_31036328-0c3d-44b3-8c04-1a17251d021e" xlink:href="lpx-20250630.xsd#lpx_SidingSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d410afc2-5f9a-4322-b346-858d11df530f" xlink:to="loc_lpx_SidingSegmentMember_31036328-0c3d-44b3-8c04-1a17251d021e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_OSBSegmentMember_e361eadd-e731-4d97-acb0-5aecdac26793" xlink:href="lpx-20250630.xsd#lpx_OSBSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d410afc2-5f9a-4322-b346-858d11df530f" xlink:to="loc_lpx_OSBSegmentMember_e361eadd-e731-4d97-acb0-5aecdac26793" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_LPSouthAmericaSegmentMember_9cb0ed84-b52a-4c80-94f1-2c8696298b8b" xlink:href="lpx-20250630.xsd#lpx_LPSouthAmericaSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d410afc2-5f9a-4322-b346-858d11df530f" xlink:to="loc_lpx_LPSouthAmericaSegmentMember_9cb0ed84-b52a-4c80-94f1-2c8696298b8b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllOtherSegmentsMember_61fa8b5e-3f8c-407f-970c-ef7881f55b85" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllOtherSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d410afc2-5f9a-4322-b346-858d11df530f" xlink:to="loc_us-gaap_AllOtherSegmentsMember_61fa8b5e-3f8c-407f-970c-ef7881f55b85" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_c2b37a67-8f9a-4733-9318-1e375eec4b14" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fad3ed0b-04d2-476c-935f-be4b12c53419" xlink:to="loc_us-gaap_Revenues_c2b37a67-8f9a-4733-9318-1e375eec4b14" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lpcorp.com/role/FairValueMeasurementsDetails" xlink:type="simple" xlink:href="lpx-20250630.xsd#FairValueMeasurementsDetails"/>
  <link:definitionLink xlink:role="http://www.lpcorp.com/role/FairValueMeasurementsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_c688a23d-5a6f-4078-8a2c-a34ff368679e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6d87c523-3df7-4fdc-9493-4a55c8f38c93" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_c688a23d-5a6f-4078-8a2c-a34ff368679e" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6d87c523-3df7-4fdc-9493-4a55c8f38c93" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_f414777e-0334-4a17-b205-bc0b1dc2903b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6d87c523-3df7-4fdc-9493-4a55c8f38c93" xlink:to="loc_us-gaap_DebtInstrumentAxis_f414777e-0334-4a17-b205-bc0b1dc2903b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_f414777e-0334-4a17-b205-bc0b1dc2903b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_f414777e-0334-4a17-b205-bc0b1dc2903b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_f414777e-0334-4a17-b205-bc0b1dc2903b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_a4877770-9ae5-42fa-9016-4291174a3e40" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_f414777e-0334-4a17-b205-bc0b1dc2903b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_a4877770-9ae5-42fa-9016-4291174a3e40" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_SeniorUnsecuredNotesMaturing2029Member_2b6d5aa5-bc0d-4877-8003-f9444af81c48" xlink:href="lpx-20250630.xsd#lpx_SeniorUnsecuredNotesMaturing2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a4877770-9ae5-42fa-9016-4291174a3e40" xlink:to="loc_lpx_SeniorUnsecuredNotesMaturing2029Member_2b6d5aa5-bc0d-4877-8003-f9444af81c48" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_AmendedCreditFacilityMember_436c0550-ed53-444f-a804-68a15f5f3e0b" xlink:href="lpx-20250630.xsd#lpx_AmendedCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a4877770-9ae5-42fa-9016-4291174a3e40" xlink:to="loc_lpx_AmendedCreditFacilityMember_436c0550-ed53-444f-a804-68a15f5f3e0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_1af7e6fb-7900-48f6-a70f-8c92d67e3093" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6d87c523-3df7-4fdc-9493-4a55c8f38c93" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_1af7e6fb-7900-48f6-a70f-8c92d67e3093" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_1af7e6fb-7900-48f6-a70f-8c92d67e3093_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_1af7e6fb-7900-48f6-a70f-8c92d67e3093" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_1af7e6fb-7900-48f6-a70f-8c92d67e3093_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_b62cda47-42ee-4464-908d-52abf4df1207" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_1af7e6fb-7900-48f6-a70f-8c92d67e3093" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_b62cda47-42ee-4464-908d-52abf4df1207" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_5e612d39-e68d-4e68-99a9-f30e555058c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_b62cda47-42ee-4464-908d-52abf4df1207" xlink:to="loc_us-gaap_SeniorNotesMember_5e612d39-e68d-4e68-99a9-f30e555058c5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_SeniorUnsecuredNotesMaturing2029Member_4ff5ea97-ecb0-480b-9a79-79e2d19b1534" xlink:href="lpx-20250630.xsd#lpx_SeniorUnsecuredNotesMaturing2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_b62cda47-42ee-4464-908d-52abf4df1207" xlink:to="loc_lpx_SeniorUnsecuredNotesMaturing2029Member_4ff5ea97-ecb0-480b-9a79-79e2d19b1534" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_aebdb21a-882f-4785-ae64-81d69d2a1eff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_b62cda47-42ee-4464-908d-52abf4df1207" xlink:to="loc_us-gaap_LineOfCreditMember_aebdb21a-882f-4785-ae64-81d69d2a1eff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_LetterOfCreditSubLimitMember_defaa794-41cc-4e39-9d4c-e5a5bb0922db" xlink:href="lpx-20250630.xsd#lpx_LetterOfCreditSubLimitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_b62cda47-42ee-4464-908d-52abf4df1207" xlink:to="loc_lpx_LetterOfCreditSubLimitMember_defaa794-41cc-4e39-9d4c-e5a5bb0922db" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_60a9136f-081f-4936-84ef-7e9d85a61dd0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6d87c523-3df7-4fdc-9493-4a55c8f38c93" xlink:to="loc_us-gaap_CreditFacilityAxis_60a9136f-081f-4936-84ef-7e9d85a61dd0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_60a9136f-081f-4936-84ef-7e9d85a61dd0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_60a9136f-081f-4936-84ef-7e9d85a61dd0" xlink:to="loc_us-gaap_CreditFacilityDomain_60a9136f-081f-4936-84ef-7e9d85a61dd0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_5e1cbbd3-13ba-45ae-a3d5-498ddc8b59a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_60a9136f-081f-4936-84ef-7e9d85a61dd0" xlink:to="loc_us-gaap_CreditFacilityDomain_5e1cbbd3-13ba-45ae-a3d5-498ddc8b59a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_75350af7-234c-4fe5-a373-a0e54c10d3f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_5e1cbbd3-13ba-45ae-a3d5-498ddc8b59a3" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_75350af7-234c-4fe5-a373-a0e54c10d3f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_8faa1491-a818-4a69-bd1a-853494b90467" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_c688a23d-5a6f-4078-8a2c-a34ff368679e" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_8faa1491-a818-4a69-bd1a-853494b90467" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_1065101e-f007-42fb-a8d0-cb6ed2db7b5b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_c688a23d-5a6f-4078-8a2c-a34ff368679e" xlink:to="loc_us-gaap_LongTermDebt_1065101e-f007-42fb-a8d0-cb6ed2db7b5b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_cff4e2df-da5b-47f1-9abe-4459b5fe1c2c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_c688a23d-5a6f-4078-8a2c-a34ff368679e" xlink:to="loc_us-gaap_LongTermDebtFairValue_cff4e2df-da5b-47f1-9abe-4459b5fe1c2c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_4d9ff2d6-fa46-4ff1-80ac-1e81c6cbd3f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_c688a23d-5a6f-4078-8a2c-a34ff368679e" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_4d9ff2d6-fa46-4ff1-80ac-1e81c6cbd3f1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_82f4c4c1-7686-4cb4-88f0-809a02808598" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_c688a23d-5a6f-4078-8a2c-a34ff368679e" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_82f4c4c1-7686-4cb4-88f0-809a02808598" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lpcorp.com/role/GoodwillandOtherIntangibleAssetsDetails" xlink:type="simple" xlink:href="lpx-20250630.xsd#GoodwillandOtherIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.lpcorp.com/role/GoodwillandOtherIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_adf1feb6-a087-4221-b7cf-9644139cfde1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_871aa13f-d3ab-433b-b7fd-6d05e73dde16" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_adf1feb6-a087-4221-b7cf-9644139cfde1" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_871aa13f-d3ab-433b-b7fd-6d05e73dde16" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_6828dad9-01da-415d-bd9d-5613f0e7a89a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_871aa13f-d3ab-433b-b7fd-6d05e73dde16" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_6828dad9-01da-415d-bd9d-5613f0e7a89a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6828dad9-01da-415d-bd9d-5613f0e7a89a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_6828dad9-01da-415d-bd9d-5613f0e7a89a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6828dad9-01da-415d-bd9d-5613f0e7a89a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9fc35ce1-84e0-441d-bdb4-dcb6bae5fd90" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_6828dad9-01da-415d-bd9d-5613f0e7a89a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9fc35ce1-84e0-441d-bdb4-dcb6bae5fd90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductiveLandMember_195b87c0-aeaa-44ec-9c8d-e5ce1f5d7d14" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProductiveLandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9fc35ce1-84e0-441d-bdb4-dcb6bae5fd90" xlink:to="loc_us-gaap_ProductiveLandMember_195b87c0-aeaa-44ec-9c8d-e5ce1f5d7d14" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_3a1117b7-ada4-4596-932d-70a1169b8f30" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9fc35ce1-84e0-441d-bdb4-dcb6bae5fd90" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_3a1117b7-ada4-4596-932d-70a1169b8f30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimberAndTimberlands_a7e649f7-95b5-4980-8730-5dd411c8c274" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TimberAndTimberlands"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_adf1feb6-a087-4221-b7cf-9644139cfde1" xlink:to="loc_us-gaap_TimberAndTimberlands_a7e649f7-95b5-4980-8730-5dd411c8c274" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_4f62c3bc-d6bf-4369-9e92-5ff261c76e53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_adf1feb6-a087-4221-b7cf-9644139cfde1" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_4f62c3bc-d6bf-4369-9e92-5ff261c76e53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_1ac6f227-5ac4-4a26-a818-3e31b1331c97" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_adf1feb6-a087-4221-b7cf-9644139cfde1" xlink:to="loc_us-gaap_Goodwill_1ac6f227-5ac4-4a26-a818-3e31b1331c97" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_c0948674-4d9a-49f5-b769-a7bc24be33f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_adf1feb6-a087-4221-b7cf-9644139cfde1" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_c0948674-4d9a-49f5-b769-a7bc24be33f9" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lpcorp.com/role/ImpairmentsofLongLivedAssetsDetails" xlink:type="simple" xlink:href="lpx-20250630.xsd#ImpairmentsofLongLivedAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.lpcorp.com/role/ImpairmentsofLongLivedAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedLineItems_a497b52f-4407-4140-9a1a-f5cc57d3b427" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ImpairedLongLivedAssetsHeldAndUsedLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfImpairedLongLivedAssetsHeldAndUsedTable_c014c21d-22fd-4098-8bc0-4a1d98dd7a77" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfImpairedLongLivedAssetsHeldAndUsedTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedLineItems_a497b52f-4407-4140-9a1a-f5cc57d3b427" xlink:to="loc_us-gaap_ScheduleOfImpairedLongLivedAssetsHeldAndUsedTable_c014c21d-22fd-4098-8bc0-4a1d98dd7a77" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis_e470dcd3-b1d1-4566-b043-835e0470e581" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfImpairedLongLivedAssetsHeldAndUsedTable_c014c21d-22fd-4098-8bc0-4a1d98dd7a77" xlink:to="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis_e470dcd3-b1d1-4566-b043-835e0470e581" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedAssetNameDomain_e470dcd3-b1d1-4566-b043-835e0470e581_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ImpairedLongLivedAssetsHeldAndUsedAssetNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis_e470dcd3-b1d1-4566-b043-835e0470e581" xlink:to="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedAssetNameDomain_e470dcd3-b1d1-4566-b043-835e0470e581_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedAssetNameDomain_809da368-0bb6-459a-b623-dec8d05e3d01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ImpairedLongLivedAssetsHeldAndUsedAssetNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis_e470dcd3-b1d1-4566-b043-835e0470e581" xlink:to="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedAssetNameDomain_809da368-0bb6-459a-b623-dec8d05e3d01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentMember_bc1f96ce-b5e6-43d5-b77d-232e1eb33d55" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedAssetNameDomain_809da368-0bb6-459a-b623-dec8d05e3d01" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentMember_bc1f96ce-b5e6-43d5-b77d-232e1eb33d55" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetImpairmentCharges_e08c207c-786a-4adc-adf0-d98977986a86" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedLineItems_a497b52f-4407-4140-9a1a-f5cc57d3b427" xlink:to="loc_us-gaap_AssetImpairmentCharges_e08c207c-786a-4adc-adf0-d98977986a86" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TangibleAssetImpairmentCharges_d9d2fdf7-8562-4ea3-8395-7be4f33aa9aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TangibleAssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedLineItems_a497b52f-4407-4140-9a1a-f5cc57d3b427" xlink:to="loc_us-gaap_TangibleAssetImpairmentCharges_d9d2fdf7-8562-4ea3-8395-7be4f33aa9aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfLeasehold_dbe1ec6c-2394-4816-b69a-cb3e398f7cf6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ImpairmentOfLeasehold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedLineItems_a497b52f-4407-4140-9a1a-f5cc57d3b427" xlink:to="loc_us-gaap_ImpairmentOfLeasehold_dbe1ec6c-2394-4816-b69a-cb3e398f7cf6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseImpairmentLoss_419c9cd0-5708-4039-8183-1ffac756d264" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedLineItems_a497b52f-4407-4140-9a1a-f5cc57d3b427" xlink:to="loc_us-gaap_OperatingLeaseImpairmentLoss_419c9cd0-5708-4039-8183-1ffac756d264" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lpcorp.com/role/CommitmentsandContingenciesDetails" xlink:type="simple" xlink:href="lpx-20250630.xsd#CommitmentsandContingenciesDetails"/>
  <link:definitionLink xlink:role="http://www.lpcorp.com/role/CommitmentsandContingenciesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_8a099107-5bcd-4ed6-9744-4cde5073cda6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_9c2bfe1a-c251-4d6a-8388-627610a90956" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_8a099107-5bcd-4ed6-9744-4cde5073cda6" xlink:to="loc_us-gaap_LossContingenciesTable_9c2bfe1a-c251-4d6a-8388-627610a90956" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_b4bce6ed-1ecc-4e89-9ba6-ee2acb68da98" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_9c2bfe1a-c251-4d6a-8388-627610a90956" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_b4bce6ed-1ecc-4e89-9ba6-ee2acb68da98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_b4bce6ed-1ecc-4e89-9ba6-ee2acb68da98_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_b4bce6ed-1ecc-4e89-9ba6-ee2acb68da98" xlink:to="loc_us-gaap_LossContingencyNatureDomain_b4bce6ed-1ecc-4e89-9ba6-ee2acb68da98_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_d0dbc7ed-87b3-4fae-a92b-ed058d95c7bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_b4bce6ed-1ecc-4e89-9ba6-ee2acb68da98" xlink:to="loc_us-gaap_LossContingencyNatureDomain_d0dbc7ed-87b3-4fae-a92b-ed058d95c7bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReserveForEnvironmentalCostsMember_690b9723-2ed9-4b0c-97d1-a09404bd74ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReserveForEnvironmentalCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_d0dbc7ed-87b3-4fae-a92b-ed058d95c7bb" xlink:to="loc_us-gaap_ReserveForEnvironmentalCostsMember_690b9723-2ed9-4b0c-97d1-a09404bd74ef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyAccrualAtCarryingValue_5e28f6b2-28b6-4314-9c89-0fdb548bef31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyAccrualAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_8a099107-5bcd-4ed6-9744-4cde5073cda6" xlink:to="loc_us-gaap_LossContingencyAccrualAtCarryingValue_5e28f6b2-28b6-4314-9c89-0fdb548bef31" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccrualForEnvironmentalLossContingenciesGross_e2a2f1ec-662b-4d34-b417-260fd04bb2bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccrualForEnvironmentalLossContingenciesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_8a099107-5bcd-4ed6-9744-4cde5073cda6" xlink:to="loc_us-gaap_AccrualForEnvironmentalLossContingenciesGross_e2a2f1ec-662b-4d34-b417-260fd04bb2bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyAccrualCarryingValueCurrent_3d696660-d587-4b2f-91ad-de8b09000fae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyAccrualCarryingValueCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_8a099107-5bcd-4ed6-9744-4cde5073cda6" xlink:to="loc_us-gaap_LossContingencyAccrualCarryingValueCurrent_3d696660-d587-4b2f-91ad-de8b09000fae" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyAccrualCarryingValueNoncurrent_2bf0e790-929c-48f5-adec-d48f65f0f88a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyAccrualCarryingValueNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_8a099107-5bcd-4ed6-9744-4cde5073cda6" xlink:to="loc_us-gaap_LossContingencyAccrualCarryingValueNoncurrent_2bf0e790-929c-48f5-adec-d48f65f0f88a" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lpcorp.com/role/AccumulatedComprehensiveLossDetails" xlink:type="simple" xlink:href="lpx-20250630.xsd#AccumulatedComprehensiveLossDetails"/>
  <link:definitionLink xlink:role="http://www.lpcorp.com/role/AccumulatedComprehensiveLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_6ea0db41-d39a-4bc1-a6b1-ed8547f9ba78" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_f55acc23-faac-45e1-b4e2-029e4475050d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_6ea0db41-d39a-4bc1-a6b1-ed8547f9ba78" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_f55acc23-faac-45e1-b4e2-029e4475050d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_5439860c-3fef-409d-b54b-49b182319b21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_f55acc23-faac-45e1-b4e2-029e4475050d" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_5439860c-3fef-409d-b54b-49b182319b21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_5439860c-3fef-409d-b54b-49b182319b21_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_5439860c-3fef-409d-b54b-49b182319b21" xlink:to="loc_us-gaap_EquityComponentDomain_5439860c-3fef-409d-b54b-49b182319b21_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_3a8fcdd8-7bf3-4822-b2a5-c432885c41b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_5439860c-3fef-409d-b54b-49b182319b21" xlink:to="loc_us-gaap_EquityComponentDomain_3a8fcdd8-7bf3-4822-b2a5-c432885c41b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_b81fe87d-e84b-4df6-a0b4-4cae48a38f87" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_3a8fcdd8-7bf3-4822-b2a5-c432885c41b3" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_b81fe87d-e84b-4df6-a0b4-4cae48a38f87" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_4728bb68-a201-4541-8a0e-566f73d7ce91" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_b81fe87d-e84b-4df6-a0b4-4cae48a38f87" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_4728bb68-a201-4541-8a0e-566f73d7ce91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_56e703a5-3727-4d04-abc2-1b31bb57c8ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AOCIAttributableToParentNetOfTaxRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_6ea0db41-d39a-4bc1-a6b1-ed8547f9ba78" xlink:to="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_56e703a5-3727-4d04-abc2-1b31bb57c8ca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_686cdc9d-ee19-49ec-8591-9017faef4ba0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_56e703a5-3727-4d04-abc2-1b31bb57c8ca" xlink:to="loc_us-gaap_StockholdersEquity_686cdc9d-ee19-49ec-8591-9017faef4ba0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_e7fab15d-4dda-4727-ab35-db3f69c0db8c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_56e703a5-3727-4d04-abc2-1b31bb57c8ca" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_e7fab15d-4dda-4727-ab35-db3f69c0db8c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_df0c5763-afcb-4944-a11d-3830aa154245" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lpcorp.com/role/SelectedSegmentDataScheduleofSegmentReportingInformationbySegmentDetails" xlink:type="simple" xlink:href="lpx-20250630.xsd#SelectedSegmentDataScheduleofSegmentReportingInformationbySegmentDetails"/>
  <link:definitionLink xlink:role="http://www.lpcorp.com/role/SelectedSegmentDataScheduleofSegmentReportingInformationbySegmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_7e07bfb9-1e38-4b5c-af90-d24bce6f70e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_c89493b7-8d3d-46de-9d3e-14b6445b8760" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7e07bfb9-1e38-4b5c-af90-d24bce6f70e6" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_c89493b7-8d3d-46de-9d3e-14b6445b8760" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_3c0f2309-0c7c-41a5-b6d4-251ee664111d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_c89493b7-8d3d-46de-9d3e-14b6445b8760" xlink:to="loc_srt_ConsolidationItemsAxis_3c0f2309-0c7c-41a5-b6d4-251ee664111d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_3c0f2309-0c7c-41a5-b6d4-251ee664111d_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_3c0f2309-0c7c-41a5-b6d4-251ee664111d" xlink:to="loc_srt_ConsolidationItemsDomain_3c0f2309-0c7c-41a5-b6d4-251ee664111d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_1ce2aae9-e808-41fd-9ed2-502994818dc0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_3c0f2309-0c7c-41a5-b6d4-251ee664111d" xlink:to="loc_srt_ConsolidationItemsDomain_1ce2aae9-e808-41fd-9ed2-502994818dc0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_4f2c5697-2c9f-407b-ae75-160b50b66e4d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_1ce2aae9-e808-41fd-9ed2-502994818dc0" xlink:to="loc_us-gaap_OperatingSegmentsMember_4f2c5697-2c9f-407b-ae75-160b50b66e4d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_3bb91ab4-6f4e-4ba5-9cdc-accc422ed468" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_1ce2aae9-e808-41fd-9ed2-502994818dc0" xlink:to="loc_us-gaap_CorporateNonSegmentMember_3bb91ab4-6f4e-4ba5-9cdc-accc422ed468" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_c9ce5c17-24d0-485d-b726-5eed38eb7e07" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_c89493b7-8d3d-46de-9d3e-14b6445b8760" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_c9ce5c17-24d0-485d-b726-5eed38eb7e07" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_c9ce5c17-24d0-485d-b726-5eed38eb7e07_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_c9ce5c17-24d0-485d-b726-5eed38eb7e07" xlink:to="loc_us-gaap_SegmentDomain_c9ce5c17-24d0-485d-b726-5eed38eb7e07_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_ec00f015-c07a-4d49-8847-0cc441a8e996" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_c9ce5c17-24d0-485d-b726-5eed38eb7e07" xlink:to="loc_us-gaap_SegmentDomain_ec00f015-c07a-4d49-8847-0cc441a8e996" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_SidingSegmentMember_d5e50e68-68e6-43b1-a725-b9118112e5db" xlink:href="lpx-20250630.xsd#lpx_SidingSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ec00f015-c07a-4d49-8847-0cc441a8e996" xlink:to="loc_lpx_SidingSegmentMember_d5e50e68-68e6-43b1-a725-b9118112e5db" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_OSBSegmentMember_a3b90dd4-bc54-4b81-b998-ec7fe7c4aea0" xlink:href="lpx-20250630.xsd#lpx_OSBSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ec00f015-c07a-4d49-8847-0cc441a8e996" xlink:to="loc_lpx_OSBSegmentMember_a3b90dd4-bc54-4b81-b998-ec7fe7c4aea0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_LPSouthAmericaSegmentMember_f1bda5b3-ebea-4217-adf9-4013d48d1868" xlink:href="lpx-20250630.xsd#lpx_LPSouthAmericaSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ec00f015-c07a-4d49-8847-0cc441a8e996" xlink:to="loc_lpx_LPSouthAmericaSegmentMember_f1bda5b3-ebea-4217-adf9-4013d48d1868" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_85f25176-6a9b-49d4-a0e6-ff7ed7553995" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7e07bfb9-1e38-4b5c-af90-d24bce6f70e6" xlink:to="loc_us-gaap_Revenues_85f25176-6a9b-49d4-a0e6-ff7ed7553995" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_87e8d799-0cea-4688-a7c4-23d706a06931" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7e07bfb9-1e38-4b5c-af90-d24bce6f70e6" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_87e8d799-0cea-4688-a7c4-23d706a06931" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_52e4ea23-bed4-4c8f-9e8d-710ec5e2a444" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7e07bfb9-1e38-4b5c-af90-d24bce6f70e6" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_52e4ea23-bed4-4c8f-9e8d-710ec5e2a444" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_e740d485-b31f-4052-a0f5-344b9e29e941" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7e07bfb9-1e38-4b5c-af90-d24bce6f70e6" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_e740d485-b31f-4052-a0f5-344b9e29e941" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherExpenses_75281e0a-98e7-4fdf-a844-08eceefba8cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7e07bfb9-1e38-4b5c-af90-d24bce6f70e6" xlink:to="loc_us-gaap_OtherExpenses_75281e0a-98e7-4fdf-a844-08eceefba8cf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_AdjustedEBITDA_d7d0d455-9564-4911-a715-d907c3342c1c" xlink:href="lpx-20250630.xsd#lpx_AdjustedEBITDA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7e07bfb9-1e38-4b5c-af90-d24bce6f70e6" xlink:to="loc_lpx_AdjustedEBITDA_d7d0d455-9564-4911-a715-d907c3342c1c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_d4e48396-7e9a-44b7-a662-08b17dec3de7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7e07bfb9-1e38-4b5c-af90-d24bce6f70e6" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_d4e48396-7e9a-44b7-a662-08b17dec3de7" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.lpcorp.com/role/SelectedSegmentDataIdentifiableAssetsbySegmentDetails" xlink:type="simple" xlink:href="lpx-20250630.xsd#SelectedSegmentDataIdentifiableAssetsbySegmentDetails"/>
  <link:definitionLink xlink:role="http://www.lpcorp.com/role/SelectedSegmentDataIdentifiableAssetsbySegmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_d9c34a7f-ecb3-4917-8870-bb092286a622" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_e5e17b7b-2965-4f99-9cc0-b0ef67e5eaa9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d9c34a7f-ecb3-4917-8870-bb092286a622" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_e5e17b7b-2965-4f99-9cc0-b0ef67e5eaa9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_a46a6dcf-9253-4a10-8c9d-07038d19f037" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_e5e17b7b-2965-4f99-9cc0-b0ef67e5eaa9" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_a46a6dcf-9253-4a10-8c9d-07038d19f037" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_a46a6dcf-9253-4a10-8c9d-07038d19f037_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_a46a6dcf-9253-4a10-8c9d-07038d19f037" xlink:to="loc_us-gaap_SegmentDomain_a46a6dcf-9253-4a10-8c9d-07038d19f037_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_ac359b89-304c-4f02-b33b-0c87ecea6b77" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_a46a6dcf-9253-4a10-8c9d-07038d19f037" xlink:to="loc_us-gaap_SegmentDomain_ac359b89-304c-4f02-b33b-0c87ecea6b77" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_SidingSegmentMember_fdb441e9-1788-4d95-b221-225d2d7a08a0" xlink:href="lpx-20250630.xsd#lpx_SidingSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ac359b89-304c-4f02-b33b-0c87ecea6b77" xlink:to="loc_lpx_SidingSegmentMember_fdb441e9-1788-4d95-b221-225d2d7a08a0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_OSBSegmentMember_1959ead8-1134-4a5e-acaa-c8a249d5e879" xlink:href="lpx-20250630.xsd#lpx_OSBSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ac359b89-304c-4f02-b33b-0c87ecea6b77" xlink:to="loc_lpx_OSBSegmentMember_1959ead8-1134-4a5e-acaa-c8a249d5e879" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lpx_LPSouthAmericaSegmentMember_e7d407dc-304b-487f-81cc-da32c9f10f1b" xlink:href="lpx-20250630.xsd#lpx_LPSouthAmericaSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ac359b89-304c-4f02-b33b-0c87ecea6b77" xlink:to="loc_lpx_LPSouthAmericaSegmentMember_e7d407dc-304b-487f-81cc-da32c9f10f1b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllOtherSegmentsMember_e7ff61f1-8366-413b-8b6a-d127dd4c421b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllOtherSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ac359b89-304c-4f02-b33b-0c87ecea6b77" xlink:to="loc_us-gaap_AllOtherSegmentsMember_e7ff61f1-8366-413b-8b6a-d127dd4c421b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_fd5d9ec0-1781-4978-ab0d-aa52cbb454a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d9c34a7f-ecb3-4917-8870-bb092286a622" xlink:to="loc_us-gaap_Assets_fd5d9ec0-1781-4978-ab0d-aa52cbb454a5" xlink:type="arc" order="0"/>
  </link:definitionLink>
</link:linkbase>
