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            <filer>
                <filerCredentials>
                    <cik>0001549466</cik>
                    <ccc>XXXXXXXX</ccc>
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            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



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    <formData>
        <issuerInfo>
            <issuerCik>0000075677</issuerCik>
            <issuerName>PACKAGING CORPORATION OF AMERICA</issuerName>
            <secFileNumber>001-15399</secFileNumber>
            <issuerAddress>
                <ns2:street1>1 North Field Court</ns2:street1>
                <ns2:city>Lake Forest</ns2:city>
                <ns2:stateOrCountry>IL</ns2:stateOrCountry>
                <ns2:zipCode>60045</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>(847) 482-3000</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>KENT PFLEDERER</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Officer</relationshipToIssuer>
            </relationshipsToIssuer>
        </issuerInfo>
        <securitiesInformation>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
                <address>
                    <ns2:street1>1 New York Plaza</ns2:street1>
                    <ns2:street2>38th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>4000</noOfUnitsSold>
            <aggregateMarketValue>603730.80</aggregateMarketValue>
            <noOfUnitsOutstanding>89915081</noOfUnitsOutstanding>
            <approxSaleDate>10/30/2023</approxSaleDate>
            <securitiesExchangeName>NYSE</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>04/05/2023</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>4000</amountOfSecuritiesAcquired>
            <paymentDate>04/05/2023</paymentDate>
            <natureOfPayment>Services Rendered</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>10/30/2023</noticeDate>
            <planAdoptionDates/>
            <signature>/s/ Kent Allen Pflederer</signature>
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144
0001549466
XXXXXXXX
LIVE
0000075677
PACKAGING CORPORATION OF AMERICA
001-15399
1 North Field Court
Lake Forest
IL
60045
(847) 482-3000
KENT PFLEDERER
Officer
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
38th Floor
New York
NY
10004
4000
603730.80
89915081
10/30/2023
NYSE
Common
04/05/2023
Restricted stock vesting under a registered plan
Issuer
N
4000
04/05/2023
Services Rendered
Y
10/30/2023
/s/ Kent Allen Pflederer