<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>3</documentType>
<periodOfReport>2003-10-20</periodOfReport>
    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000910721</issuerCik>
        <issuerName>J JILL GROUP INC</issuerName>
        <issuerTradingSymbol>JILL</issuerTradingSymbol>
</issuer>
<reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001268464</rptOwnerCik>
            <rptOwnerName>PEARSON STEPHEN</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>14 HOLLY CIRCLE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>WESTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02394</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>0</isDirector>
<isOfficer>1</isOfficer>
<isTenPercentOwner>0</isTenPercentOwner>
<isOther>0</isOther>
<officerTitle>EVP/Merchand. and Prod. Dev.</officerTitle>
<otherText></otherText>
</reportingOwnerRelationship>
</reportingOwner>
<nonDerivativeTable></nonDerivativeTable>
<derivativeTable><derivativeHolding><securityTitle><value>Incentive Stock Option (right to buy)</value>
</securityTitle>
<conversionOrExercisePrice><value>15.94</value>
</conversionOrExercisePrice>
<exerciseDate><value>2003-06-04</value>
<footnoteId id="F1"></footnoteId>
<footnoteId id="F4"></footnoteId>
</exerciseDate>
<expirationDate><value>2013-06-04</value>
</expirationDate>
<underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value>
</underlyingSecurityTitle>
<underlyingSecurityShares><value>18000</value>
</underlyingSecurityShares>
</underlyingSecurity>
<ownershipNature><directOrIndirectOwnership><value>D</value>
</directOrIndirectOwnership>
</ownershipNature>
</derivativeHolding>
<derivativeHolding><securityTitle><value>Nonqualified Stock Option (right to buy)</value>
</securityTitle>
<conversionOrExercisePrice><value>15.94</value>
</conversionOrExercisePrice>
<exerciseDate><value>2003-06-04</value>
<footnoteId id="F2"></footnoteId>
<footnoteId id="F4"></footnoteId>
</exerciseDate>
<expirationDate><value>2013-06-04</value>
</expirationDate>
<underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value>
</underlyingSecurityTitle>
<underlyingSecurityShares><value>7000</value>
</underlyingSecurityShares>
</underlyingSecurity>
<ownershipNature><directOrIndirectOwnership><value>D</value>
</directOrIndirectOwnership>
</ownershipNature>
</derivativeHolding>
<derivativeHolding><securityTitle><value>Nonqualified Stock Option (right to buy)</value>
</securityTitle>
<conversionOrExercisePrice><value>12.78</value>
</conversionOrExercisePrice>
<exerciseDate><value>2003-10-20</value>
<footnoteId id="F3"></footnoteId>
<footnoteId id="F4"></footnoteId>
</exerciseDate>
<expirationDate><value>2013-10-20</value>
</expirationDate>
<underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value>
</underlyingSecurityTitle>
<underlyingSecurityShares><value>25000</value>
</underlyingSecurityShares>
</underlyingSecurity>
<ownershipNature><directOrIndirectOwnership><value>D</value>
</directOrIndirectOwnership>
</ownershipNature>
</derivativeHolding>
</derivativeTable>
<footnotes><footnote id="F1">Date indicated is date of grant.  Option vests as follows (a) one-third on June 4, 2004; (b) one-third on June 4, 2005; and (c) one-third on June 4, 2006.</footnote>
<footnote id="F2">Date indicated is date of grant.  Option vests as follows (a) one-third on June 4, 2004; (b) one-third on June 4, 2005; and (c) one-third on June 4, 2006.</footnote>
<footnote id="F3">Date indicated is date of grant.  Option vests as follows (a) one-third on October 20, 2004; (b) one-third on October 20, 2005; and (c) one-third on October 20, 2006.</footnote>
<footnote id="F4">Option vests in full upon death of holder while employed by the Company.  Option is subject to accelerated vesting in event that "Qualified Sale" occurs and immediately prior to such Qualified Sale holder is an employee of the Company.  Immediately prior to such Qualified Sale option shall become exercisable as to an additional one-third of the shares subject to the option.  "Qualified Sale" means closing of sale of all or substantially all of assets or issued and outstanding capital stock of the Company, or closing of merger or consolidation involving the Company in which stockholders of the Company immediately before such merger or consolidation do not own immediately after such merger or consolidation capital stock or other equity interest of surviving corporation or entity representing more than fifty percent in voting power of capital stock or other equity interest of such surviving corporation or entity outstanding immediately after such merger or consolid.</footnote>
</footnotes>
<ownerSignature><signatureName>/s/ Stephen Pearson</signatureName>
<signatureDate>2003-10-30</signatureDate>
</ownerSignature>
</ownershipDocument>

