<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2006-01-25</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001282977</issuerCik>
        <issuerName>GREENHILL &amp; CO INC</issuerName>
        <issuerTradingSymbol>GHL</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001288494</rptOwnerCik>
            <rptOwnerName>BORROWS SIMON A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>GREENHILL &amp; CO., INC.</rptOwnerStreet1>
            <rptOwnerStreet2>300 PARK AVENUE</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Non-U.S. President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Stock Unit</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2006-01-25</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>57843</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>57843</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>57843</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">This restricted stock unit award was granted pursuant to the Greenhill &amp; Co., Inc. Equity Incentive Plan.  19,281 shares of
 Common Stock underlying this restricted stock unit award vest on January 1 of the fifth calendar year following the grant
 date.  The remaining 38,562 shares of Common Stock underlying this restricted stock unit award vest in ratable installments
 on January 1 of each of the first, second, third, fourth and fifth calendar years following the grant date.  The restricted
 stock unit award is subject to payment within 75 days following the applicable vesting date.  Each unit represents a right
 to receive one share of Common Stock or an amount equal to the market value of the Common Stock underlying the award on the
 applicable vesting date.  Payment may be made in cash, shares of Common Stock or a combination thereof.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Ulrika Ekman, Attorney-in-Fact for Simon A. Borrows</signatureName>
        <signatureDate>2006-01-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
