Report of Foreign Issuer (6-k)

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: July, 2017		Commission File Number: 1-12384

SUNCOR ENERGY INC.
(Name of registrant)

150 – 6th Avenue S.W.
P.O. Box 2844
Calgary, Alberta
Canada, T2P 3E3

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		Form 40-F                     X

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):                            

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):                            

The Registrant's Management's Discussion and Analysis for the second quarter ended June 30, 2017, included as Exhibit 99.2 of this Form 6-K, and the Unaudited Consolidated Financial Statements for the second quarter ended June 30, 2017, included as Exhibit 99.3 of this Form 6-K, are each incorporated by reference into and as an exhibit to, as applicable, the Registrant's Registration Statements under the Securities Act of 1933: Form S-8 (File No. 333-87604), Form S-8 (File No. 333-112234), Form S-8 (File No. 333-118648), Form S-8 (File No. 333-124415), Form S-8 (File No. 333-149532), Form S-8 (File No. 333-161021), Form S-8 (File No. 333-161029) and Form F-10 (File No. 333-212212).

---

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:				By:
July 26, 2017						" Shawn Poirier "   Shawn Poirier   Assistant Corporate   Secretary

---

EXHIBIT INDEX

Exhibit		Description of Exhibit
99.1		Report to Shareholders for the second quarter ended June 30, 2017
99.2		Management's Discussion and Analysis for the second quarter ended June 30, 2017
99.3		Unaudited Consolidated Financial Statements for the second quarter ended June 30, 2017
99.4		Certification of the President and Chief Executive Officer
99.5		Certification of the Executive Vice President and Chief Financial Officer

---

QuickLinks

SIGNATURES
EXHIBIT INDEX