Imperial Oil Limited (IMO) 10-Q 2009 Q1 Quarterly report

Exhibit (32.1)

Certification of Periodic Financial Report

Pursuant to 18 U.S.C. Section 1350

For purposes of 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of theSarbanes-Oxley Act of 2002, the undersigned, Bruce H. March, the chief executive officer of Imperial Oil Limited (the “Company”), hereby certifies that, to his knowledge:

(i) the Quarterly Report on Form 10-Q of the Company for the quarter ended March 31, 2009, as filed with the Securities and Exchange Commission (the “Report”), fully complies with the requirements of section 13(a) or 15(d) of theSecurities Exchange Act of 1934; and

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

Dated: April 30, 2009

/s/ Bruce. H. March

Bruce H. March

Chairman of the Board, President and

Chief Executive Officer