<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:ns2="http://www.sec.gov/edgar/common">
    <headerData>
        <submissionType>144</submissionType>
        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001855325</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0001013857</issuerCik>
            <issuerName>PEGASYSTEMS INC</issuerName>
            <secFileNumber>001-11859</secFileNumber>
            <issuerAddress>
                <ns2:street1>One Main Street</ns2:street1>
                <ns2:city>Cambridge</ns2:city>
                <ns2:stateOrCountry>MA</ns2:stateOrCountry>
                <ns2:zipCode>02142</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>6173749600</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>RIFAT KERIM AKGONUL</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>8th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>3000</noOfUnitsSold>
            <aggregateMarketValue>209160.00</aggregateMarketValue>
            <noOfUnitsOutstanding>85409645</noOfUnitsOutstanding>
            <approxSaleDate>08/01/2024</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>03/02/2022</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock Units</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>3000</amountOfSecuritiesAcquired>
            <paymentDate>03/02/2022</paymentDate>
            <natureOfPayment>N/A</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for RIFAT KERIM AKGONUL</name>
                <address>
                    <ns2:street1>One Main Street</ns2:street1>
                    <ns2:city>Cambridge</ns2:city>
                    <ns2:stateOrCountry>MA</ns2:stateOrCountry>
                    <ns2:zipCode>02142</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>COMMON</securitiesClassTitle>
            <saleDate>07/25/2024</saleDate>
            <amountOfSecuritiesSold>1000</amountOfSecuritiesSold>
            <grossProceeds>70000.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for RIFAT KERIM AKGONUL</name>
                <address>
                    <ns2:street1>One Main Street</ns2:street1>
                    <ns2:city>Cambridge</ns2:city>
                    <ns2:stateOrCountry>MA</ns2:stateOrCountry>
                    <ns2:zipCode>02142</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>COMMON</securitiesClassTitle>
            <saleDate>07/01/2024</saleDate>
            <amountOfSecuritiesSold>2000</amountOfSecuritiesSold>
            <grossProceeds>119548.10</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for RIFAT KERIM AKGONUL</name>
                <address>
                    <ns2:street1>One Main Street</ns2:street1>
                    <ns2:city>Cambridge</ns2:city>
                    <ns2:stateOrCountry>MA</ns2:stateOrCountry>
                    <ns2:zipCode>02142</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>COMMON</securitiesClassTitle>
            <saleDate>06/26/2024</saleDate>
            <amountOfSecuritiesSold>1000</amountOfSecuritiesSold>
            <grossProceeds>60000.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for RIFAT KERIM AKGONUL</name>
                <address>
                    <ns2:street1>One Main Street</ns2:street1>
                    <ns2:city>Cambridge</ns2:city>
                    <ns2:stateOrCountry>MA</ns2:stateOrCountry>
                    <ns2:zipCode>02142</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>COMMON</securitiesClassTitle>
            <saleDate>06/03/2024</saleDate>
            <amountOfSecuritiesSold>1000</amountOfSecuritiesSold>
            <grossProceeds>57875.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <remarks>The securities to be sold were acquired upon the vesting of restricted stock units during the period of  03/02/2022 through 06/07/2024
</remarks>
        <noticeSignature>
            <noticeDate>08/01/2024</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>11/09/2023</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ Rifat Kerim Akgonul</signature>
        </noticeSignature>
    </formData>
</edgarSubmission>
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144
0001855325
XXXXXXXX
LIVE
0001013857
PEGASYSTEMS INC
001-11859
One Main Street
Cambridge
MA
02142
6173749600
RIFAT KERIM AKGONUL
Officer
COMMON
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
3000
209160.00
85409645
08/01/2024
NASDAQ
Common
03/02/2022
Restricted Stock Units
Issuer
N
3000
03/02/2022
N/A
N
10b5-1 Sales for RIFAT KERIM AKGONUL
One Main Street
Cambridge
MA
02142
COMMON
07/25/2024
1000
70000.00
10b5-1 Sales for RIFAT KERIM AKGONUL
One Main Street
Cambridge
MA
02142
COMMON
07/01/2024
2000
119548.10
10b5-1 Sales for RIFAT KERIM AKGONUL
One Main Street
Cambridge
MA
02142
COMMON
06/26/2024
1000
60000.00
10b5-1 Sales for RIFAT KERIM AKGONUL
One Main Street
Cambridge
MA
02142
COMMON
06/03/2024
1000
57875.00
The securities to be sold were acquired upon the vesting of restricted stock units during the period of  03/02/2022 through 06/07/2024
08/01/2024
11/09/2023
/s/ Rifat Kerim Akgonul