FORM 6-K

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SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

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Report of Foreign Private Issuer

Pursuant to Rule 13a - 16 or 15d - 16 of

the Securities Exchange Act of 1934

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SUNCOR ENERGY INC.

(Name of registrant)

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150 – 6th Avenue S.W.

P.O. Box 2844

Calgary, Alberta

Canada, T2P 3E3

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

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The Registrant’s Management’s Discussion and Analysis for the first quarter ended March 31, 2026, included as Exhibit 99.1 of this Form 6-K, and the Unaudited Consolidated Financial Statements for the first quarter ended March 31, 2026, included as Exhibit 99.2 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. 333-279937).

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SIGNATURES

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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.

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EXHIBIT INDEX

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