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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019dc03c-ef1e-7e76-84a6-6e384ebff60d,g:1e708a70-7075-4d8b-9922-dbee7254b6d2-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:oln="http://www.olin.com/20251231" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2024-01-31" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.olin.com/20251231">
  <xs:import namespace="http://fasb.org/srt/2026" schemaLocation="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap-ebp/2026" schemaLocation="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2026" schemaLocation="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd"/>
  <xs:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2026" schemaLocation="https://xbrl.sec.gov/dei/2026/dei-2026.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="oln-20251231_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="oln-20251231_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="oln-20251231_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="oln-20251231_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="DocumentandEntityInformation" roleURI="http://www.olin.com/role/DocumentandEntityInformation">
        <link:definition>0000001 - Document - Document and Entity Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StatementsofNetAssetsAvailableforBenefits" roleURI="http://www.olin.com/role/StatementsofNetAssetsAvailableforBenefits">
        <link:definition>0000002 - Statement - Statements of Net Assets Available for Benefits</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StatementsofChangesinNetAssetsAvailableforBenefits" roleURI="http://www.olin.com/role/StatementsofChangesinNetAssetsAvailableforBenefits">
        <link:definition>0000003 - Statement - Statements of Changes in Net Assets Available for Benefits</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DescriptionofthePlan" roleURI="http://www.olin.com/role/DescriptionofthePlan">
        <link:definition>0000004 - Disclosure - Description of the Plan</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryofSignificantAccountingPolicies" roleURI="http://www.olin.com/role/SummaryofSignificantAccountingPolicies">
        <link:definition>0000005 - Disclosure - Summary of Significant Accounting Policies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurements" roleURI="http://www.olin.com/role/FairValueMeasurements">
        <link:definition>0000006 - Disclosure - Fair Value Measurements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="TaxStatus" roleURI="http://www.olin.com/role/TaxStatus">
        <link:definition>0000007 - Disclosure - Tax Status</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PartyinInterestTransactions" roleURI="http://www.olin.com/role/PartyinInterestTransactions">
        <link:definition>0000008 - Disclosure - Party-in-Interest Transactions</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ChangeinRecordkeeperandCustodian" roleURI="http://www.olin.com/role/ChangeinRecordkeeperandCustodian">
        <link:definition>0000009 - Disclosure - Change in Recordkeeper and Custodian</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleHLine4iScheduleofAssetsHeldatEndofYear" roleURI="http://www.olin.com/role/ScheduleHLine4iScheduleofAssetsHeldatEndofYear">
        <link:definition>0000010 - Disclosure - Schedule H, Line 4i - Schedule of Assets (Held at End of Year)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleHLine4iScheduleofAssetsHeldatEndofYear_1" roleURI="http://www.olin.com/role/ScheduleHLine4iScheduleofAssetsHeldatEndofYear_1">
        <link:definition>0000010 - Disclosure - Schedule H, Line 4i - Schedule of Assets (Held at End of Year)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryofSignificantAccountingPoliciesPolicies" roleURI="http://www.olin.com/role/SummaryofSignificantAccountingPoliciesPolicies">
        <link:definition>0000011 - Disclosure - Summary of Significant Accounting Policies (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DescriptionofthePlanTables" roleURI="http://www.olin.com/role/DescriptionofthePlanTables">
        <link:definition>0000012 - Disclosure - Description of the Plan (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryofSignificantAccountingPoliciesTables" roleURI="http://www.olin.com/role/SummaryofSignificantAccountingPoliciesTables">
        <link:definition>0000013 - Disclosure - Summary of Significant Accounting Policies (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsTables" roleURI="http://www.olin.com/role/FairValueMeasurementsTables">
        <link:definition>0000014 - Disclosure - Fair Value Measurements (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="TaxStatusTables" roleURI="http://www.olin.com/role/TaxStatusTables">
        <link:definition>0000015 - Disclosure - Tax Status (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PartyinInterestTransactionsTables" roleURI="http://www.olin.com/role/PartyinInterestTransactionsTables">
        <link:definition>0000016 - Disclosure - Party-in-Interest Transactions (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ChangeinRecordkeeperandCustodianTables" roleURI="http://www.olin.com/role/ChangeinRecordkeeperandCustodianTables">
        <link:definition>0000017 - Disclosure - Change in Recordkeeper and Custodian (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleHLine4iScheduleofAssetsHeldatEndofYearTables" roleURI="http://www.olin.com/role/ScheduleHLine4iScheduleofAssetsHeldatEndofYearTables">
        <link:definition>0000018 - Disclosure - Schedule H, Line 4i - Schedule of Assets (Held at End of Year) (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DescriptionofthePlanDetails" roleURI="http://www.olin.com/role/DescriptionofthePlanDetails">
        <link:definition>0000019 - Disclosure - Description of the Plan (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryofSignificantAccountingPoliciesDetails" roleURI="http://www.olin.com/role/SummaryofSignificantAccountingPoliciesDetails">
        <link:definition>0000020 - Disclosure - Summary of Significant Accounting Policies (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsDetails" roleURI="http://www.olin.com/role/FairValueMeasurementsDetails">
        <link:definition>0000021 - Disclosure - Fair Value Measurements (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsDetails_1" roleURI="http://www.olin.com/role/FairValueMeasurementsDetails_1">
        <link:definition>0000021 - Disclosure - Fair Value Measurements (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="TaxStatusDetails" roleURI="http://www.olin.com/role/TaxStatusDetails">
        <link:definition>0000022 - Disclosure - Tax Status (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PartyinInterestTransactionsDetails" roleURI="http://www.olin.com/role/PartyinInterestTransactionsDetails">
        <link:definition>0000023 - Disclosure - Party-in-Interest Transactions (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PartyinInterestTransactionsDetails_1" roleURI="http://www.olin.com/role/PartyinInterestTransactionsDetails_1">
        <link:definition>0000023 - Disclosure - Party-in-Interest Transactions (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ChangeinRecordkeeperandCustodianDetails" roleURI="http://www.olin.com/role/ChangeinRecordkeeperandCustodianDetails">
        <link:definition>0000024 - Disclosure - Change in Recordkeeper and Custodian (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleHLine4iScheduleofAssetsHeldatEndofYearDetails" roleURI="http://www.olin.com/role/ScheduleHLine4iScheduleofAssetsHeldatEndofYearDetails">
        <link:definition>0000025 - Disclosure - Schedule H, Line 4i - Schedule of Assets (Held at End of Year) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleHLine4iScheduleofAssetsHeldatEndofYearDetails_1" roleURI="http://www.olin.com/role/ScheduleHLine4iScheduleofAssetsHeldatEndofYearDetails_1">
        <link:definition>0000025 - Disclosure - Schedule H, Line 4i - Schedule of Assets (Held at End of Year) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="oln_EBP032Member" abstract="true" name="EBP032Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oln_EBPChangeInRecordkeeperAndCustodianTable" abstract="true" name="EBPChangeInRecordkeeperAndCustodianTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="oln_EBPChangeInRecordkeeperAndCustodianLineItems" abstract="true" name="EBPChangeInRecordkeeperAndCustodianLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="oln_ChangeInRecordkeeperAndCustodianTextBlock" abstract="false" name="ChangeInRecordkeeperAndCustodianTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="oln_EmployeeBenefitPlanScheduleOfAssetsHeldTextBlockTextBlock" abstract="false" name="EmployeeBenefitPlanScheduleOfAssetsHeldTextBlockTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="oln_TrustFundManagementPolicyTextBlock" abstract="false" name="TrustFundManagementPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="oln_EmployerContributionsReceivablePolicyTextBlock" abstract="false" name="EmployerContributionsReceivablePolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="oln_RetirementContributionVestingScheduleExcludingSafeHarborTableTextBlock" abstract="false" name="RetirementContributionVestingScheduleExcludingSafeHarborTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="oln_InvestmentsMeasuredAtNetAssetValueTableTextBlock" abstract="false" name="InvestmentsMeasuredAtNetAssetValueTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="oln_RelatedPartyAndPartyInInterestBalanceTabularDisclosureTableTextBlock" abstract="false" name="RelatedPartyAndPartyInInterestBalanceTabularDisclosureTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="oln_FeesPaidToPartiesInInterestTableTextBlock" abstract="false" name="FeesPaidToPartiesInInterestTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="oln_RetirementSavingsPlanVestingAxis" abstract="true" name="RetirementSavingsPlanVestingAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="oln_RetirementSavingsPlanVestingDomain" abstract="true" name="RetirementSavingsPlanVestingDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oln_LessThan2YearsOfServiceMember" abstract="true" name="LessThan2YearsOfServiceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oln_A2YearsOfServiceMember" abstract="true" name="A2YearsOfServiceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oln_A3YearsOfServiceOrMoreMember" abstract="true" name="A3YearsOfServiceOrMoreMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oln_AutomaticEscalationPercentage" abstract="false" name="AutomaticEscalationPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oln_AutomaticEscalationPercentageMaximum" abstract="false" name="AutomaticEscalationPercentageMaximum" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oln_OlinCommonStockFundMaximumAllocationPercentage" abstract="false" name="OlinCommonStockFundMaximumAllocationPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oln_RetirementContributionVestingPercentage" abstract="false" name="RetirementContributionVestingPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oln_MatchingContributionImmediateVestingPercentage" abstract="false" name="MatchingContributionImmediateVestingPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oln_RetirementContributionPercentageImmediatelyVested" abstract="false" name="RetirementContributionPercentageImmediatelyVested" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oln_MaximumLoanTermYears" abstract="false" name="MaximumLoanTermYears" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="oln_OutstandingLoanRateMinimum" abstract="false" name="OutstandingLoanRateMinimum" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oln_OutstandingLoanRateMaximum" abstract="false" name="OutstandingLoanRateMaximum" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oln_NewLoanRateMinimum" abstract="false" name="NewLoanRateMinimum" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oln_NewLoanRateMaximum" abstract="false" name="NewLoanRateMaximum" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oln_InvestmentsMeasuredAtFairValueExcludingCommonCollectiveTrustFundsMember" abstract="true" name="InvestmentsMeasuredAtFairValueExcludingCommonCollectiveTrustFundsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oln_FairValueInvestmentNAVRedemptionNoticePeriodApplicable" abstract="false" name="FairValueInvestmentNAVRedemptionNoticePeriodApplicable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="oln_EmpowerEmpowerTrustMember" abstract="true" name="EmpowerEmpowerTrustMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oln_VoyaVoyaTrustMember" abstract="true" name="VoyaVoyaTrustMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oln_StateStreetMember" abstract="true" name="StateStreetMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oln_OlinCommonStockPurchasesAmount" abstract="false" name="OlinCommonStockPurchasesAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oln_OlinCommonStockSalesAmount" abstract="false" name="OlinCommonStockSalesAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oln_FeesPaidToRelatedPartiesAndPartiesInInterest" abstract="false" name="FeesPaidToRelatedPartiesAndPartiesInInterest" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oln_LoanMaturityDate" abstract="false" name="LoanMaturityDate" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
</xs:schema>
