6-K

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: October 2011 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   o Form 40-F  x

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 x

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

N/A

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:
October 28, 2011		“Shawn Poirier”
		Shawn Poirier
		Assistant Corporate Secretary

2

EXHIBIT INDEX

Exhibit	Description of Exhibit
99.1	Press Release Dated October 27, 2011, Suncor Energy to Release Third Quarter 2011 Financial Results

3

EX-99.1

EXHIBIT 99.1

Press Release Dated October 27, 2011, Suncor Energy to Release Third Quarter 2011

Financial Results

Media Advisory

FOR IMMEDIATE RELEASE

Suncor Energy to release third quarter 2011 financial results

Calgary, Alberta (Oct. 27, 2011) — Suncor Energy Inc. will release its third quarter financial results on Thursday, Nov. 3, 2011 at 12:30 a.m. MDT (2:30 a.m. EDT).

Following the release, a teleconference to review the third quarter will be held at 8:00 a.m. MDT (10:00 a.m. EDT). Representing management will be Rick George, president and chief executive officer, Steve Williams, chief operating officer and Bart Demosky, chief financial officer. A question and answer period will follow brief remarks from management. Steve Douglas, vice president, Investor Relations, will host the call.

To participate in the teleconference:

·if calling from North America:  1 866-226-1799

·if calling from outside North America: +1 416-340-2220

To participate in the conference via webcast, go to www.suncor.com/webcasts.

An archive of the conference call will be available until Nov. 10, 2011.

To access the archive:

·from North America:  1 800-408-3053 (pass code: 6338686)

·from outside North America: +1 905-694-9451 (pass code: 6338686)

Suncor Energy Inc. is Canada’s premier integrated energy company. Suncor’s operations include oil sands development and upgrading, conventional and offshore oil and gas production, petroleum refining, and product marketing under the Petro-Canada brand. While working to responsibly develop petroleum resources, Suncor is also developing a growing renewable energy portfolio. Suncor’s common shares (symbol: SU) are listed on the Toronto and New York stock exchanges.

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For more information about Suncor Energy Inc. please visit our web site at www.suncor.com.

Investor inquiries:	Media inquiries:
800-558-9071	403-296-4000
invest@suncor.com	media@suncor.com

Suncor Energy Inc.

150 6 Avenue S.W., Calgary, Alberta T2P 3E3

Website: www.suncor.com