EXHIBIT 99.3
                                                                    ------------



                CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
                  ---------------------------------------------



In connection with the Annual Report of Canadian Natural Resources Limited (the
"Company") on Form 40-F for the period ended December 31, 2002 (the "Report") to
which this certificate is an exhibit, I, John G. Langille, President of the
Company, hereby 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.

Date:  April 15, 2003
                                             /s/ John G. Langille
                                             -----------------------------------
                                             Name:  John G. Langille
                                             Title:  President




A signed original of this written statement required by Section 906 has been
provided to Canadian Natural Resources Limited and will be retained by Canadian
Natural Resources Limited and furnished to the Securities and Exchange
Commission or its staff upon request.