-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 RjQaYhqCkge7wpDiW/jRLxTE1V/W9iUTITL0p5VqmNJmzDGVvYS0buDxOTXGw2WT
 Gd9JuZY1hIeWyruSJA0i6w==

<SEC-DOCUMENT>0001179110-05-013063.txt : 20050627
<SEC-HEADER>0001179110-05-013063.hdr.sgml : 20050627
<ACCEPTANCE-DATETIME>20050627143826
ACCESSION NUMBER:		0001179110-05-013063
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050623
FILED AS OF DATE:		20050627
DATE AS OF CHANGE:		20050627

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SPHERIX INC
		CENTRAL INDEX KEY:			0000012239
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-ENGINEERING, ACCOUNTING, RESEARCH, MANAGEMENT [8700]
		IRS NUMBER:				520849320
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		12051 INDIAN CREEK CT
		CITY:			BELTSVILLE
		STATE:			MD
		ZIP:			20705
		BUSINESS PHONE:		3014193900

	MAIL ADDRESS:	
		STREET 1:		12051 INDIAN CREEK COURT
		CITY:			BELTSVILLE
		STATE:			MD
		ZIP:			20705

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BIOSPHERICS INC
		DATE OF NAME CHANGE:	19920703

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BIOSPHERICS RESEARCH INC
		DATE OF NAME CHANGE:	19720404

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BROWN DOUGLAS T
		CENTRAL INDEX KEY:			0001281207

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-05576
		FILM NUMBER:		05917183

	BUSINESS ADDRESS:	
		STREET 1:		4514 WOODFIELD ROAD
		CITY:			KENSINGTON
		STATE:			MD
		ZIP:			20895
		BUSINESS PHONE:		3015301698
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 4 -
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-06-23</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000012239</issuerCik>
        <issuerName>SPHERIX INC</issuerName>
        <issuerTradingSymbol>SPEX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001281207</rptOwnerCik>
            <rptOwnerName>BROWN DOUGLAS T</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>SPHERIX INCORPORATED</rptOwnerStreet1>
            <rptOwnerStreet2>12051 INDIAN CREEK COURT</rptOwnerStreet2>
            <rptOwnerCity>BELTSVILLE</rptOwnerCity>
            <rptOwnerState>MD</rptOwnerState>
            <rptOwnerZipCode>20705</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2005-06-23</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>5777</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.6459</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5777</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2005-06-23</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>4223</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.659</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>10000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes></footnotes>

    <ownerSignature>
        <signatureName>Douglas T. Brown</signatureName>
        <signatureDate>2005-06-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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