QuickLinks -- Click here to rapidly navigate through this document


FORM 6-K

SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

Report of Foreign Private Issuer
Pursuant to Rule 13a-16 or 15d-16 of
the Securities Exchange Act of 1934

For the month of: April 2009   Commission File Number: 1-12384


SUNCOR ENERGY INC.
(Name of registrant)


112 Fourth Avenue S.W.
P.O. Box 38
Calgary, Alberta
Canada, T2P 2V5

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

Form 20-F   o   Form 40-F   ý

Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the SEC pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934:

Yes   o   No   ý

If "Yes" is marked, indicate the number assigned to the registrant in connection with Rule 12g3-2(b):

N/A            



CONTROLS AND PROCEDURES

A.
Disclosure Controls and Procedures
B.
Changes in Internal Control Over Financial Reporting


EXHIBIT INDEX

Exhibit   Description of Exhibit

99.1

 

Press Release Including 2009 Outlook

99.2

 

Interim Management's Discussion and Analysis for the first fiscal quarter ended March 31, 2009

99.3

 

Interim Unaudited Financial Statements of Suncor Energy Inc. for the three months ended March 31, 2009

99.4

 

Certification of the President and Chief Executive Officer

99.5

 

Certification of the Senior Vice President and Chief Financial Officer



SIGNATURES

        Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

    SUNCOR ENERGY INC.

Date: April 23, 2009

 

 

 

 

 

 

By:

 

/s/ ARLENE STROM

Arlene Strom
Assistant Corporate Secretary



QuickLinks

FORM 6-K
SUNCOR ENERGY INC. (Name of registrant)
112 Fourth Avenue S.W. P.O. Box 38 Calgary, Alberta Canada, T2P 2V5
CONTROLS AND PROCEDURES
EXHIBIT INDEX
SIGNATURES