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 ~~June 17~~August 4, 2004

Commission File Number 33-95280

FALCONBRIDGE LIMITED
(Translation of registrant's name into English)

BCE Place, 181 Bay Street, Suite 200
Toronto, Ontario, Canada M5J 2T3
(Address of principal executive offices)

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

Form 20-F

Form 40-F

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

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

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

If "Yes" is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82-3920

The documents listed in the Exhibit List ~~below~~to this Form 6-K are furnished pursuant to ~~this~~ Form 6-K.

In addition, the exhibits identified below shall be deemed filed under the Securities Exchange Act of 1934 for the purpose of being incorporated by reference as exhibits (with the ~~Exhibit~~numbers ~~List~~ shown below) into the registrant's Registration Statement on Form F-9 (File No. 333-111485):

Exhibit No.	Description
	4.9	Registrant's Unaudited Consolidated Financial Statements, and the related notes thereto, as at and for the three months ended June 30, 2004 and 2003.
99.1	Press Release, dated June 17, 2004, of Falconbridge Limited regarding Falconbridge Limited's announcement that "Collahuasi Rosario Project Commissioned"
	4.10	Management's Discussion and Analysis of Financial Condition and Results of Operations

Exhibit Index

Exhibit No.		Description
99.1		Registrant's Unaudited Consolidated Financial Statements, and the related notes thereto, as at and for the three months ended June 30, 2004 and 2003.
99.2		Management's Discussion and Analysis of Financial Condition and Results of Operations
99.3		Certification of Interim Filings by Aaron Regent, President and Chief Executive Officer
99.4		Certification of Interim Filings by Michael Doolan, Senior Vice President and Chief Financial Officer

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.

	FALCONBRIDGE LIMITED (Registrant)
June 17, 2004
August 4, 2004
	By:	/s/ STEPHEN K. YOUNG Stephen K. Young Corporate Secretary

Exhibit Index

Exhibit No.		Description
99.1		Press Release, dated June 17, 2004, of Falconbridge Limited regarding Falconbridge Limited's announcement that "Collahuasi Rosario Project Commissioned"

QuickLinks

Exhibit Index
SIGNATURES

Filing Compare · FALCONBRIDGE LTD \CAN\