UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 6-K

Report of Foreign Issuer

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

of the Securities Exchange Act of 1934

Dated March 2, 2015

Commission file number 001-15254

ENBRIDGE INC.

(Exact name of Registrant as specified in its charter)

3000, 425 – 1^st Street S.W.

Calgary, Alberta, Canada T2P 3L8

(Address of principal executive offices and postal code)

(403) 231-3900

(Registrants telephone number, including area code)

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):

Yes  ¨            No   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)(7):

Yes  ¨            No   x

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

Yes  ¨            No   x

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

N/A

The following document is being submitted herewith:

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.

2

NEWS RELEASE

Enbridge Files 2014 Year End Disclosure Documents

Calgary, ALBERTA—Feb. 19, 2015—Enbridge Inc. (TSX:ENB) (NYSE:ENB) has filed its Annual Information Form, audited Consolidated Financial Statements and related Management’s Discussion and Analysis for the year ended December 31, 2014, with Canadian securities regulatory authorities. Enbridge has also filed its Form 40-F for the year ended December 31, 2014, with the United States Securities and Exchange Commission.

Copies of these documents are available electronically at www.sedar.com (Canadian filings) or www.sec.gov (U.S. filings), or the Company’s website at www.enbridge.com/investorfilings. Printed copies of the Consolidated Financial Statements and Management’s Discussion and Analysis are available on request by calling 1-800-481-2804 or writing the Company’s Investor Relations department at:

Enbridge Inc.

Investor Relations

3000, 425 - 1st Street S.W.

Calgary, Alberta, Canada T2P 3L8

Enbridge’s Notice of Annual Meeting and Management Information Circular are expected to be mailed to Enbridge common shareholders at the end of March. Enbridge’s Annual Meeting of Shareholders will be held at 1:30 p.m. EDT on Wednesday, May 6, 2015, in the Aria Ballroom of the Four Seasons Hotel, 60 Yorkville Avenue, Toronto, Ontario. A live audio webcast of the meeting will be available at www.enbridge.com.

About Enbridge Inc.

Enbridge Inc., a Canadian Company, is a North American leader in delivering energy and has been included on the Global 100 Most Sustainable Corporations in the World ranking for the past seven years. As a transporter of energy, Enbridge operates, in Canada and the U.S., the world’s longest crude oil and liquids transportation system. The Company also has a significant and growing involvement in natural gas gathering, transmission and midstream businesses, and an increasing involvement in power transmission. As a distributor of energy, Enbridge owns and operates Canada’s largest natural gas distribution company, and provides distribution services in Ontario, Quebec, New Brunswick and New York State. As a generator of energy, Enbridge has interests in more than 1,800 megawatts of renewable and alternative energy generating capacity and is expanding its interests in wind and solar energy and geothermal. Enbridge employs more than 11,000 people, primarily in Canada and the U.S. and is ranked as one of Canada’s Top 100 Employers for 2014. Enbridge’s common shares trade on the Toronto and New York stock exchanges under the symbol ENB. For more information, visit www.enbridge.com.

FOR FURTHER INFORMATION PLEASE CONTACT: