FORM 6-K

SECURITIES AND EXCHANGE COMMISSION

Report of Foreign Private Issuer

Pursuant to Rule 13a-16 or 15d-16 of

ENCANA CORPORATION

1800, 855 — 2^nd Street SW
Calgary, Alberta, Canada T2P 2S5
(Address of principal executive office)

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       ü    

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):          

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

Yes             No       ü    

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82-        

This report furnished on Form 6-K shall be incorporated by reference into each of the Registration Statements under the Securities Act of 1933 of the registrant: Form S-8 No. 333-13956, Form S-8 No. 333-85598 and Form F-9 No. 333-98087.

Table of Contents

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.

Date: March 5, 2004

Form 6-K Exhibit Index

Exhibit No.

EnCana files 2003 year end disclosure documents

CALGARY, Alberta (March 5, 2004) – EnCana Corporation (TSX, NYSE: ECA) today filed its audited consolidated financial statements and accompanying notes for the year ended December 31, 2003 and related Management’s Discussion and Analysis with Canadian securities regulatory authorities. EnCana has also filed its annual information form for the year ended December 31, 2003, which includes the disclosure and reports relating to reserves data and other oil and gas information required pursuant to National Instrument 51-101 of the Canadian Securities Administrators. Copies of these documents may be obtained via www.sedar.com or the company’s Web site, www.encana.com, or by e-mailing investor.relations@encana.com.

Further information on EnCana Corporation is available on the company’s Web site, www.encana.com.

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