content: <?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>0001247456</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0000075677</issuerCik>
        <issuerName>PACKAGING CORP OF AMERICA</issuerName>
        <secFileNumber>001-15399</secFileNumber>
        <issuerAddress>
          <com:street1>1955 W FIELD CT</com:street1>
          <com:city>LAKE FOREST</com:city>
          <com:stateOrCountry>IL</com:stateOrCountry>
          <com:zipCode>60045</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>8474823000</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>KOWLZAN MARK W</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>10% Stockholder</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Northern Trust Securities, INC</name>
          <address>
            <com:street1>50 S Lasalle ST</com:street1>
            <com:city>Chicago</com:city>
            <com:stateOrCountry>IL</com:stateOrCountry>
            <com:zipCode>60603</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>53196</noOfUnitsSold>
        <aggregateMarketValue>9681672.00</aggregateMarketValue>
        <noOfUnitsOutstanding>89624119</noOfUnitsOutstanding>
        <approxSaleDate>03/04/2024</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>07/30/2021</acquiredDate>
        <natureOfAcquisitionTransaction>Stock Award</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>5433</amountOfSecuritiesAcquired>
        <paymentDate>03/30/2021</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>06/25/2021</acquiredDate>
        <natureOfAcquisitionTransaction>Stock Award</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>14079</amountOfSecuritiesAcquired>
        <paymentDate>06/25/2021</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>06/21/2021</acquiredDate>
        <natureOfAcquisitionTransaction>Stock Award</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>12864</amountOfSecuritiesAcquired>
        <paymentDate>06/21/2021</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>06/29/2020</acquiredDate>
        <natureOfAcquisitionTransaction>Stock Award</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>20820</amountOfSecuritiesAcquired>
        <paymentDate>06/29/2020</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <remarks>Sold under: MARK WILLIAM KOWLZAN TTEE MARK WILLIAM KOWLZAN REVOC TRUST U/A 1/24/06</remarks>
      <noticeSignature>
        <noticeDate>03/04/2024</noticeDate>
        <signature>/s/ Carmen Zamores as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for KOWLZAN MARK W</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 4507}]
text: 144
  0001247456
  XXXXXXXX
  LIVE
  0000075677
  PACKAGING CORP OF AMERICA
  001-15399
  1955 W FIELD CT
  LAKE FOREST
  IL
  60045
  8474823000
  KOWLZAN MARK W
  10% Stockholder
  Common
  Northern Trust Securities, INC
  50 S Lasalle ST
  Chicago
  IL
  60603
  53196
  9681672.00
  89624119
  03/04/2024
  NYSE
  Common
  07/30/2021
  Stock Award
  Issuer
  N
  5433
  03/30/2021
  Compensation
  Common
  06/25/2021
  Stock Award
  Issuer
  N
  14079
  06/25/2021
  Compensation
  Common
  06/21/2021
  Stock Award
  Issuer
  N
  12864
  06/21/2021
  Compensation
  Common
  06/29/2020
  Stock Award
  Issuer
  N
  20820
  06/29/2020
  Compensation
  Y
  Sold under: MARK WILLIAM KOWLZAN TTEE MARK WILLIAM KOWLZAN REVOC TRUST U/A 1/24/06
  03/04/2024
  /s/ Carmen Zamores as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for KOWLZAN MARK W