<?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>0001553647</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>Dowd Joseph P</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</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>PR</com:stateOrCountry>
          <com:zipCode>02917</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>15262</noOfUnitsSold>
      <aggregateMarketValue>479670.59</aggregateMarketValue>
      <noOfUnitsOutstanding>20827742</noOfUnitsOutstanding>
      <approxSaleDate>06/06/2023</approxSaleDate>
      <securitiesExchangeName>NYSE</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>06/06/2023</acquiredDate>
      <natureOfAcquisitionTransaction>Option Granted - 03/03/2015</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>4104</amountOfSecuritiesAcquired>
      <paymentDate>06/06/2023</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>06/06/2023</acquiredDate>
      <natureOfAcquisitionTransaction>Option Granted - 03/01/2016</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>11161</amountOfSecuritiesAcquired>
      <paymentDate>06/06/2023</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>06/06/2023</noticeDate>
      <signature>/s/ Gerardo Ibarra-Munoz, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Joseph Dowd</signature>
    </noticeSignature>
  </formData>
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144
0001553647
XXXXXXXX
LIVE
0001315257
Koppers Holdings Inc.
001-32737
436 SEVENTH AVENUE
PITTSBURGH
PA
15219
412-227-2001
Dowd Joseph P
Officer
Common
Fidelity Brokerage Services LLC
900 Salem Street
Smithfield
PR
02917
15262
479670.59
20827742
06/06/2023
NYSE
Common
06/06/2023
Option Granted - 03/03/2015
Issuer
N
4104
06/06/2023
Cash
Common
06/06/2023
Option Granted - 03/01/2016
Issuer
N
11161
06/06/2023
Cash
Y
06/06/2023
/s/ Gerardo Ibarra-Munoz, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Joseph Dowd