<?xml version="1.0" encoding="utf-8"?>
<!--Generated by DFIN XBRL Instance Document - http://www.dfinsolutions.com/ - Version R3.0 - on 24-March-2026 [11:12:18] {AM}-->
<schema targetNamespace="http://www.msasafety.com/20251231" elementFormDefault="qualified" xmlns:msa="http://www.msasafety.com/20251231" xmlns="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xl="http://www.xbrl.org/2003/XLink" xmlns:us-gaap="http://fasb.org/us-gaap/2025" xmlns:country="http://xbrl.sec.gov/country/2025" xmlns:dei="http://xbrl.sec.gov/dei/2025" xmlns:us-types="http://fasb.org/us-types/2025" xmlns:deprecated="http://www.xbrl.org/2009/arcrole/fact-explanatoryFact" xmlns:srt="http://fasb.org/srt/2025" xmlns:srt-types="http://fasb.org/srt-types/2025" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2024-01-31">
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    <appinfo>
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        <link:roleRef xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd#netLabel" roleURI="http://www.xbrl.org/2009/role/netLabel"  />
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          <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_AllAdjToCompMember_132704371" xlink:to="loc_MSA_PsusMember_132704405" order="103" preferredLabel="http://www.xbrl.org/2003/role/label" />
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          <link:loc xlink:type="locator" xlink:href="msa-20251231.xsd#msa_TotalEquityAwardAdjustments" xlink:label="loc_MSA_TotalEquityAwardAdjustments_132704406" />
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          <link:loc xlink:type="locator" xlink:href="msa-20251231.xsd#msa_PensionServiceCosts" xlink:label="loc_MSA_PensionServiceCosts_132704407" />
          <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems_132704435" xlink:to="loc_MSA_PensionServiceCosts_132704407" order="105" preferredLabel="http://www.xbrl.org/2003/role/label" />
        </link:presentationLink>
        <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/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: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/notAll" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#notAll"  />
        <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/ecd/role/IndividualsOnly" >
          <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AllIndividualsMember" xlink:label="loc_ecd_AllIndividualsMember_132704373" />
          <link:loc xlink:type="locator" xlink:href="msa-20251231.xsd#msa_BlancoMember" xlink:label="loc_MSA_BlancoMember_132704425" />
          <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember_132704373" xlink:to="loc_MSA_BlancoMember_132704425" order="100" />
          <link:loc xlink:type="locator" xlink:href="msa-20251231.xsd#msa_VartanianMember" xlink:label="loc_MSA_VartanianMember_132704426" />
          <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember_132704373" xlink:to="loc_MSA_VartanianMember_132704426" order="101" />
        </link:definitionLink>
        <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/ecd/role/PvpAdjustmentsOnly" >
          <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AllAdjToCompMember" xlink:label="loc_ecd_AllAdjToCompMember_132704371" />
          <link:loc xlink:type="locator" xlink:href="msa-20251231.xsd#msa_RsusMember" xlink:label="loc_MSA_RsusMember_132704404" />
          <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllAdjToCompMember_132704371" xlink:to="loc_MSA_RsusMember_132704404" order="102" />
          <link:loc xlink:type="locator" xlink:href="msa-20251231.xsd#msa_PsusMember" xlink:label="loc_MSA_PsusMember_132704405" />
          <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllAdjToCompMember_132704371" xlink:to="loc_MSA_PsusMember_132704405" order="103" />
        </link:definitionLink>
        <link:labelLink xlink:type="extended" xlink:role="http://www.xbrl.org/2003/role/link" >
          <link:loc xlink:type="locator" xlink:href="msa-20251231.xsd#msa_ChangeInValueOfPriorYearsAwardsThatVestedInApplicableYearAtVestingDate" xlink:label="loc_msa_ChangeInValueOfPriorYearsAwardsThatVestedInApplicableYearAtVestingDate" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_msa_ChangeInValueOfPriorYearsAwardsThatVestedInApplicableYearAtVestingDate" xml:lang="en-US">Change In Value Of Prior Years Awards That Vested In Applicable Year At Vesting Date</link:label>
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_msa_ChangeInValueOfPriorYearsAwardsThatVestedInApplicableYearAtVestingDate" xml:lang="en-US">Change in Value* of Prior Years' Awards that Vested in Applicable Year, at Vesting Date</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_msa_ChangeInValueOfPriorYearsAwardsThatVestedInApplicableYearAtVestingDate" xlink:to="lab_msa_ChangeInValueOfPriorYearsAwardsThatVestedInApplicableYearAtVestingDate" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_msa_ChangeInValueOfPriorYearsAwardsThatVestedInApplicableYearAtVestingDate" xml:lang="en-US">Change in value of prior years awards that vested in applicable year at vesting date</link:label>
          <link:loc xlink:type="locator" xlink:href="msa-20251231.xsd#msa_ChangeInValueOfPriorYearsAwardsUnvestedInApplicableYearAtYearEnd" xlink:label="loc_msa_ChangeInValueOfPriorYearsAwardsUnvestedInApplicableYearAtYearEnd" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_msa_ChangeInValueOfPriorYearsAwardsUnvestedInApplicableYearAtYearEnd" xml:lang="en-US">Change In Value Of Prior Years Awards Unvested In Applicable Year At Year End</link:label>
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_msa_ChangeInValueOfPriorYearsAwardsUnvestedInApplicableYearAtYearEnd" xml:lang="en-US">Change in Value* of Prior Years Awards Unvested in Applicable Year, at Year End</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_msa_ChangeInValueOfPriorYearsAwardsUnvestedInApplicableYearAtYearEnd" xlink:to="lab_msa_ChangeInValueOfPriorYearsAwardsUnvestedInApplicableYearAtYearEnd" />
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          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_msa_FairValueOfAwardsGrantedInApplicableYearAtYearEnd" xml:lang="en-US">Fair Value Of Awards Granted In Applicable Year At Year End</link:label>
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_msa_FairValueOfAwardsGrantedInApplicableYearAtYearEnd" xml:lang="en-US">Fair Value of Awards Granted in Applicable Year, at Year End</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_msa_FairValueOfAwardsGrantedInApplicableYearAtYearEnd" xlink:to="lab_msa_FairValueOfAwardsGrantedInApplicableYearAtYearEnd" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_msa_FairValueOfAwardsGrantedInApplicableYearAtYearEnd" xml:lang="en-US">Fair value of awards granted in applicable year at year end.</link:label>
          <link:loc xlink:type="locator" xlink:href="msa-20251231.xsd#msa_PensionServiceCosts" xlink:label="loc_msa_PensionServiceCosts" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_msa_PensionServiceCosts" xml:lang="en-US">Pension Service Costs</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_msa_PensionServiceCosts" xlink:to="lab_msa_PensionServiceCosts" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_msa_PensionServiceCosts" xml:lang="en-US">Pension service costs.</link:label>
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          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_msa_TotalEquityAwardAdjustments" xml:lang="en-US">Total Equity Award Adjustments</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_msa_TotalEquityAwardAdjustments" xlink:to="lab_msa_TotalEquityAwardAdjustments" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_msa_TotalEquityAwardAdjustments" xml:lang="en-US">Total equity award adjustments.</link:label>
          <link:loc xlink:type="locator" xlink:href="msa-20251231.xsd#msa_TotalValueAsOfTheEndOfThePriorYearOfForfeitedAwardsInApplicableYear" xlink:label="loc_msa_TotalValueAsOfTheEndOfThePriorYearOfForfeitedAwardsInApplicableYear" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_msa_TotalValueAsOfTheEndOfThePriorYearOfForfeitedAwardsInApplicableYear" xml:lang="en-US">Total Value As Of The End Of The Prior Year Of Forfeited Awards In Applicable Year</link:label>
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_msa_TotalValueAsOfTheEndOfThePriorYearOfForfeitedAwardsInApplicableYear" xml:lang="en-US">Total Value as of the End of the Prior Year of Forfeited Awards in Applicable Year</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_msa_TotalValueAsOfTheEndOfThePriorYearOfForfeitedAwardsInApplicableYear" xlink:to="lab_msa_TotalValueAsOfTheEndOfThePriorYearOfForfeitedAwardsInApplicableYear" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_msa_TotalValueAsOfTheEndOfThePriorYearOfForfeitedAwardsInApplicableYear" xml:lang="en-US">Total value as of the end of the prior year of forfeited awards in applicable year.</link:label>
          <link:loc xlink:type="locator" xlink:href="msa-20251231.xsd#msa_PsusMember" xlink:label="loc_msa_PsusMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_msa_PsusMember" xml:lang="en-US">PSUs [Member]</link:label>
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          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_msa_PsusMember" xml:lang="en-US">Psus</link:label>
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          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_msa_RsusMember" xml:lang="en-US">RSUs [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_msa_RsusMember" xlink:to="lab_msa_RsusMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_msa_RsusMember" xml:lang="en-US">rsusMember</link:label>
          <link:loc xlink:type="locator" xlink:href="msa-20251231.xsd#msa_BlancoMember" xlink:label="loc_msa_BlancoMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_msa_BlancoMember" xml:lang="en-US">Blanco [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_msa_BlancoMember" xlink:to="lab_msa_BlancoMember" />
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          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_msa_VartanianMember" xml:lang="en-US">Vartanian [Member]</link:label>
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        </link:labelLink>
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  </annotation>
  <import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" />
  <import namespace="http://xbrl.sec.gov/dei/2025" schemaLocation="https://xbrl.sec.gov/dei/2025/dei-2025.xsd" />
  <import namespace="http://xbrl.sec.gov/dei-sub/2025" schemaLocation="https://xbrl.sec.gov/dei/2025/dei-sub-2025.xsd" />
  <import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd" />
  <import namespace="http://fasb.org/srt/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd" />
  <import namespace="http://fasb.org/srt-types/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-types-2025.xsd" />
  <import namespace="http://xbrl.sec.gov/ecd-sub/2025" schemaLocation="https://xbrl.sec.gov/ecd/2025/ecd-sub-2025.xsd" />
  <import namespace="http://xbrl.sec.gov/ecd/2025" schemaLocation="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd" />
  <import namespace="http://www.xbrl.org/2006/ref" schemaLocation="http://www.xbrl.org/2006/ref-2006-02-27.xsd" />
  <import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <import namespace="http://fasb.org/srt-roles/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-roles-2025.xsd" />
  <element name="PayVsPerformanceDisclosureAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="msa_PayVsPerformanceDisclosureAbstract" substitutionGroup="xbrli:item" />
  <element name="PsusMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="msa_PsusMember" substitutionGroup="xbrli:item" />
  <element name="RsusMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="msa_RsusMember" substitutionGroup="xbrli:item" />
  <element name="BlancoMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="msa_BlancoMember" substitutionGroup="xbrli:item" />
  <element name="VartanianMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="msa_VartanianMember" substitutionGroup="xbrli:item" />
  <element name="ChangeInValueOfPriorYearsAwardsThatVestedInApplicableYearAtVestingDate" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="msa_ChangeInValueOfPriorYearsAwardsThatVestedInApplicableYearAtVestingDate" substitutionGroup="xbrli:item" />
  <element name="ChangeInValueOfPriorYearsAwardsUnvestedInApplicableYearAtYearEnd" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="msa_ChangeInValueOfPriorYearsAwardsUnvestedInApplicableYearAtYearEnd" substitutionGroup="xbrli:item" />
  <element name="FairValueOfAwardsGrantedInApplicableYearAtYearEnd" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="msa_FairValueOfAwardsGrantedInApplicableYearAtYearEnd" substitutionGroup="xbrli:item" />
  <element name="PensionServiceCosts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="msa_PensionServiceCosts" substitutionGroup="xbrli:item" />
  <element name="TotalEquityAwardAdjustments" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="msa_TotalEquityAwardAdjustments" substitutionGroup="xbrli:item" />
  <element name="TotalValueAsOfTheEndOfThePriorYearOfForfeitedAwardsInApplicableYear" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="msa_TotalValueAsOfTheEndOfThePriorYearOfForfeitedAwardsInApplicableYear" substitutionGroup="xbrli:item" />
  <element name="InsiderTradingPoliciesAndProceduresAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="msa_InsiderTradingPoliciesAndProceduresAbstract" substitutionGroup="xbrli:item" />
  <element name="AwardTimingDisclosureAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="msa_AwardTimingDisclosureAbstract" substitutionGroup="xbrli:item" />
</schema>
