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    <headerData>
        <submissionType>144</submissionType>
        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001783990</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0001561550</issuerCik>
            <issuerName>DATADOG INC CL A</issuerName>
            <secFileNumber>001-39051</secFileNumber>
            <issuerAddress>
                <ns2:street1>620 EIGHTH AVENUE, 45TH FLOOR </ns2:street1>
                <ns2:city>NEW YORK </ns2:city>
                <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                <ns2:zipCode>10018</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>8663294466</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>OLIVIER POMEL</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>85637</noOfUnitsSold>
            <aggregateMarketValue>10584733.20</aggregateMarketValue>
            <noOfUnitsOutstanding>305929910</noOfUnitsOutstanding>
            <approxSaleDate>04/01/2024</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>04/01/2024</acquiredDate>
            <natureOfAcquisitionTransaction>Exercise of Stock Options</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>85637</amountOfSecuritiesAcquired>
            <paymentDate>04/01/2024</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales Plan for OLIVIER POMEL</name>
                <address>
                    <ns2:street1>620 EIGHTH AVENUE, 45TH FLOOR </ns2:street1>
                    <ns2:city>NEW YORK </ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10018</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>03/05/2024</saleDate>
            <amountOfSecuritiesSold>85637</amountOfSecuritiesSold>
            <grossProceeds>10570534.59</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>OLIVIER POMEL</name>
                <address>
                    <ns2:street1>620 EIGHTH AVENUE, 45TH FLOOR </ns2:street1>
                    <ns2:city>NEW YORK </ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10018</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>03/04/2024</saleDate>
            <amountOfSecuritiesSold>42080</amountOfSecuritiesSold>
            <grossProceeds>5410532.78</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales Plan for OLIVIER POMEL</name>
                <address>
                    <ns2:street1>620 EIGHTH AVENUE, 45TH FLOOR </ns2:street1>
                    <ns2:city>NEW YORK </ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10018</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>02/26/2024</saleDate>
            <amountOfSecuritiesSold>19226</amountOfSecuritiesSold>
            <grossProceeds>2500552.79</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales Plan for OLIVIER POMEL</name>
                <address>
                    <ns2:street1>620 EIGHTH AVENUE, 45TH FLOOR </ns2:street1>
                    <ns2:city>NEW YORK </ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10018</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>02/06/2024</saleDate>
            <amountOfSecuritiesSold>85637</amountOfSecuritiesSold>
            <grossProceeds>11117027.10</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales Plan for OLIVIER POMEL</name>
                <address>
                    <ns2:street1>620 EIGHTH AVENUE, 45TH FLOOR </ns2:street1>
                    <ns2:city>NEW YORK </ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10018</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>02/06/2024</saleDate>
            <amountOfSecuritiesSold>47678</amountOfSecuritiesSold>
            <grossProceeds>6189352.94</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales Plan for OLIVIER POMEL</name>
                <address>
                    <ns2:street1>620 EIGHTH AVENUE, 45TH FLOOR </ns2:street1>
                    <ns2:city>NEW YORK </ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10018</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>01/24/2024</saleDate>
            <amountOfSecuritiesSold>10000</amountOfSecuritiesSold>
            <grossProceeds>1300000.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales Plan for OLIVIER POMEL</name>
                <address>
                    <ns2:street1>620 EIGHTH AVENUE, 45TH FLOOR </ns2:street1>
                    <ns2:city>NEW YORK </ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10018</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>01/03/2024</saleDate>
            <amountOfSecuritiesSold>85637</amountOfSecuritiesSold>
            <grossProceeds>9613755.20</grossProceeds>
        </securitiesSoldInPast3Months>
        <remarks>Securities to be sold were registered on Form S-8.</remarks>
        <noticeSignature>
            <noticeDate>04/01/2024</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>03/15/2023</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ Olivier Pomel</signature>
        </noticeSignature>
    </formData>
</edgarSubmission>
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144
0001783990
XXXXXXXX
LIVE
0001561550
DATADOG INC CL A
001-39051
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
8663294466
OLIVIER POMEL
Officer
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
85637
10584733.20
305929910
04/01/2024
NASDAQ
Common
04/01/2024
Exercise of Stock Options
Issuer
N
85637
04/01/2024
Cash
N
10b5-1 Sales Plan for OLIVIER POMEL
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
Common
03/05/2024
85637
10570534.59
OLIVIER POMEL
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
Common
03/04/2024
42080
5410532.78
10b5-1 Sales Plan for OLIVIER POMEL
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
Common
02/26/2024
19226
2500552.79
10b5-1 Sales Plan for OLIVIER POMEL
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
Common
02/06/2024
85637
11117027.10
10b5-1 Sales Plan for OLIVIER POMEL
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
Common
02/06/2024
47678
6189352.94
10b5-1 Sales Plan for OLIVIER POMEL
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
Common
01/24/2024
10000
1300000.00
10b5-1 Sales Plan for OLIVIER POMEL
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
Common
01/03/2024
85637
9613755.20
Securities to be sold were registered on Form S-8.
04/01/2024
03/15/2023
/s/ Olivier Pomel