<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0101</schemaVersion>

    <documentType>4</documentType><periodOfReport>2003-05-27</periodOfReport>
    <issuer>
        <issuerCik>0000098246</issuerCik>
        <issuerName>TIFFANY &amp; CO</issuerName>
        <issuerTradingSymbol>TIF</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId>
            <rptOwnerCik>0001016747</rptOwnerCik>
            <rptOwnerName>HAYES SAMUEL L III</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>  </rptOwnerStreet1>
            <rptOwnerStreet2>  </rptOwnerStreet2>
            <rptOwnerCity>  </rptOwnerCity>
            <rptOwnerState>  </rptOwnerState>
            <rptOwnerZipCode>  </rptOwnerZipCode>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>1</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther></reportingOwnerRelationship></reportingOwner><nonDerivativeSecurity><securityTitle><value>COMMON STOCK $.01 PAR</value></securityTitle><transactionDate><value>2003-05-27</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>S</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>500</value></transactionShares><transactionValue><value>31.19</value></transactionValue><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>18100</value><footnoteId id="F1"/></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value></value></natureOfOwnership></ownershipNature></nonDerivativeSecurity><footnotes><footnote id="F1">Reporting Person also reports Indirect Beneficial Ownership as follows: 2,079 shares held by spouse.  18,000  shares held by spouse as trustee for daughter, Elizabeth.  18,000 shares held by spouse as trustee for daughter, Susan.  18,000 shares held by spouse as trustee for daughter, Judith.</footnote></footnotes><ownerSignature><signatureName>Samuel L. Hayes, III</signatureName><signatureDate>2003-05-29</signatureDate></ownerSignature></ownershipDocument>
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X0101
4
2003-05-27
0000098246
TIFFANY & CO
TIF
0001016747
HAYES SAMUEL L III
1
0
0
0
COMMON STOCK $.01 PAR
2003-05-27
4
S
0
500
31.19
D
18100
D
Reporting Person also reports Indirect Beneficial Ownership as follows: 2,079 shares held by spouse.  18,000  shares held by spouse as trustee for daughter, Elizabeth.  18,000 shares held by spouse as trustee for daughter, Susan.  18,000 shares held by spouse as trustee for daughter, Judith.
Samuel L. Hayes, III
2003-05-29