Exhibit 32.1
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                    PRINCIPAL EXECUTIVE OFFICER CERTIFICATION
                       PURSUANT TO 18 U.S.C. SECTION 1350
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In connection  with this Annual  Report of  Knightsbridge  Tankers  Limited (the
"Company") on Form 20-F for the annual period ended  December 31, 2005, as filed
with the  Securities  and Exchange  Commission  (the "SEC") on or about the date
hereof (the "Report"), I, Tor Olav Troim, the Principal Executive Officer of the
Company,  certify,  pursuant to 18 U.S.C.  Section 1350, as adopted  pursuant to
Section 906 of the Sarbanes-Oxley Act of 2002, that:

     (1)  The Report fully  complies with the  requirements  of Section 13(a) or
          15(d) of the Securities Exchange Act of 1934; and

     (2)  The  information  contained  in the  Report  fairly  presents,  in all
          material respects,  the financial  condition and results of operations
          of the Company.

A signed original of this written statement has been provided to the Company and
will be  retained  by the  Company  and  furnished  to the SEC or its staff upon
request.

Date: June 15, 2006

/s/ Tor Olav Troim

Tor Olav Troim
Principal Executive Officer