<?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>0001376437</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0001362004</issuerCik>
            <issuerName>ICF INTL INC</issuerName>
            <secFileNumber>001-33045</secFileNumber>
            <issuerAddress>
                <ns2:street1>1902 Reston Metro Plaza</ns2:street1>
                <ns2:city>Reston</ns2:city>
                <ns2:stateOrCountry>VA</ns2:stateOrCountry>
                <ns2:zipCode>20190</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>7039343000</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>JOHN M WASSON REV TRUST</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 Fl.</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>2500</noOfUnitsSold>
            <aggregateMarketValue>335225.00</aggregateMarketValue>
            <noOfUnitsOutstanding>18816914</noOfUnitsOutstanding>
            <approxSaleDate>01/02/2024</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>01/26/2021</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock Units</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>2500</amountOfSecuritiesAcquired>
            <paymentDate>01/26/2021</paymentDate>
            <natureOfPayment>N/A</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for JOHN M WASSON REV TRUST </name>
                <address>
                    <ns2:street1>1902 Reston Metro Plaza</ns2:street1>
                    <ns2:city>Reston</ns2:city>
                    <ns2:stateOrCountry>VA</ns2:stateOrCountry>
                    <ns2:zipCode>20190</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>12/26/2023</saleDate>
            <amountOfSecuritiesSold>5000</amountOfSecuritiesSold>
            <grossProceeds>666712.50</grossProceeds>
        </securitiesSoldInPast3Months>
        <remarks>The securities to be sold were acquired upon the vesting of restricted stock units during the period of 1/26/2021 through 1/18/2022
</remarks>
        <noticeSignature>
            <noticeDate>01/02/2024</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>08/24/2023</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ John Wasson</signature>
        </noticeSignature>
    </formData>
</edgarSubmission>
[{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 4177}]
144
0001376437
XXXXXXXX
LIVE
0001362004
ICF INTL INC
001-33045
1902 Reston Metro Plaza
Reston
VA
20190
7039343000
JOHN M WASSON REV TRUST
Officer
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
38th Fl.
New York
NY
10004
2500
335225.00
18816914
01/02/2024
NASDAQ
Common
01/26/2021
Restricted Stock Units
Issuer
N
2500
01/26/2021
N/A
N
10b5-1 Sales for JOHN M WASSON REV TRUST
1902 Reston Metro Plaza
Reston
VA
20190
Common
12/26/2023
5000
666712.50
The securities to be sold were acquired upon the vesting of restricted stock units during the period of 1/26/2021 through 1/18/2022
01/02/2024
08/24/2023
/s/ John Wasson