<SUBMISSION>
<ACCESSION-NUMBER>0001253550-10-000029
<TYPE>4
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20100603
<FILING-DATE>20100607
<DATE-OF-FILING-DATE-CHANGE>20100607
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>Einiger Roger
<CIK>0001308025
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>4
<ACT>34
<FILE-NUMBER>001-07395
<FILM-NUMBER>10880341
</FILING-VALUES>
<MAIL-ADDRESS>
<STREET1>C/O THE NEWS CORPORATION LIMITED
<STREET2>1211 AVENUE OF THE AMERICAS
<CITY>NEW YORK
<STATE>NY
<ZIP>10036
</MAIL-ADDRESS>
</REPORTING-OWNER>
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>AVATAR HOLDINGS INC
<CIK>0000039677
<ASSIGNED-SIC>1531
<IRS-NUMBER>231739078
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>201 ALHAMBRA CIRCLE
<CITY>CORAL GABLES
<STATE>FL
<ZIP>33134
<PHONE>3054427000
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>201 ALHAMBRA CIRCLE
<CITY>CORAL GABLES
<STATE>FL
<ZIP>33134
</MAIL-ADDRESS>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>GAC CORP /DE/
<DATE-CHANGED>19801023
</FORMER-COMPANY>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>GENERAL ACCEPTANCE CORP
<DATE-CHANGED>19710208
</FORMER-COMPANY>
</ISSUER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-06-03</periodOfReport>

    <issuer>
        <issuerCik>0000039677</issuerCik>
        <issuerName>AVATAR HOLDINGS INC</issuerName>
        <issuerTradingSymbol>AVTR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001308025</rptOwnerCik>
            <rptOwnerName>Einiger Roger</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>33 EAST 70TH STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10021</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2010-06-03</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>705</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2011-06-03</value>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2011-06-03</value>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>705</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>705</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The units convert to Common Stock of the Issuer on a 1-for-1 basis.</footnote>
        <footnote id="F2">The units granted to the Reporting Person vest in full on the earlier of June 3, 2011 or the day immediately preceding the 2011 annual meeting of stockholders, provided that the Reporting Person is a member of the Issuer's board of directors on such date.</footnote>
        <footnote id="F3">The zero (0) in this column is a &quot;dummy&quot; amount, solely for the purpose of permitting the use of a descriptive footnote stating that the price is not applicable.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Juanita I. Kerrigan, Attorney-in-Fact for Roger W. Einiger</signatureName>
        <signatureDate>2010-06-07</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
