<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
  <headerData>
    <submissionType>144</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001229771</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0001315257</issuerCik>
      <issuerName>Koppers Holdings Inc.</issuerName>
      <secFileNumber>001-32737</secFileNumber>
      <issuerAddress>
        <com:street1>436 SEVENTH AVENUE</com:street1>
        <com:city>PITTSBURGH</com:city>
        <com:stateOrCountry>PA</com:stateOrCountry>
        <com:zipCode>15219</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>412-227-2001</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>BALL M LEROY</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
        <relationshipToIssuer>Director</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Fidelity Brokerage Services LLC</name>
        <address>
          <com:street1>900 Salem Street</com:street1>
          <com:city>Smithfield</com:city>
          <com:stateOrCountry>RI</com:stateOrCountry>
          <com:zipCode>02917</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>6000</noOfUnitsSold>
      <aggregateMarketValue>223584.34</aggregateMarketValue>
      <noOfUnitsOutstanding>20268927</noOfUnitsOutstanding>
      <approxSaleDate>11/19/2024</approxSaleDate>
      <securitiesExchangeName>NYSE</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>11/19/2024</acquiredDate>
      <natureOfAcquisitionTransaction>Options Granted 03/03/2015</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>6000</amountOfSecuritiesAcquired>
      <paymentDate>11/19/2024</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Leroy M. Ball, Jr</name>
        <address>
          <com:street1>436 Seventh Avenue</com:street1>
          <com:city>Pittsburgh</com:city>
          <com:stateOrCountry>PA</com:stateOrCountry>
          <com:zipCode>15219</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>08/27/2024</saleDate>
      <amountOfSecuritiesSold>4000</amountOfSecuritiesSold>
      <grossProceeds>156238.40</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Leroy M. Ball, Jr</name>
        <address>
          <com:street1>436 Seventh Avenue</com:street1>
          <com:city>Pittsburgh</com:city>
          <com:stateOrCountry>PA</com:stateOrCountry>
          <com:zipCode>15219</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>08/29/2024</saleDate>
      <amountOfSecuritiesSold>3803</amountOfSecuritiesSold>
      <grossProceeds>145838.66</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Leroy M. Ball, Jr</name>
        <address>
          <com:street1>436 Seventh Avenue</com:street1>
          <com:city>Pittsburgh</com:city>
          <com:stateOrCountry>PA</com:stateOrCountry>
          <com:zipCode>15219</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>11/12/2024</saleDate>
      <amountOfSecuritiesSold>5000</amountOfSecuritiesSold>
      <grossProceeds>189604.50</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Leroy M. Ball, Jr</name>
        <address>
          <com:street1>436 Seventh Avenue</com:street1>
          <com:city>Pittsburgh</com:city>
          <com:stateOrCountry>PA</com:stateOrCountry>
          <com:zipCode>15219</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>11/13/2024</saleDate>
      <amountOfSecuritiesSold>4102</amountOfSecuritiesSold>
      <grossProceeds>155093.75</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Leroy M. Ball, Jr</name>
        <address>
          <com:street1>436 Seventh Avenue</com:street1>
          <com:city>Pittsburgh</com:city>
          <com:stateOrCountry>PA</com:stateOrCountry>
          <com:zipCode>15219</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>11/14/2024</saleDate>
      <amountOfSecuritiesSold>5103</amountOfSecuritiesSold>
      <grossProceeds>192746.94</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Leroy M. Ball, Jr</name>
        <address>
          <com:street1>436 Seventh Avenue</com:street1>
          <com:city>Pittsburgh</com:city>
          <com:stateOrCountry>PA</com:stateOrCountry>
          <com:zipCode>15219</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>11/15/2024</saleDate>
      <amountOfSecuritiesSold>6000</amountOfSecuritiesSold>
      <grossProceeds>220450.20</grossProceeds>
    </securitiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>11/19/2024</noticeDate>
      <signature>/s/ Margaret Campbell, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Leroy M. Ball, Jr</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
