QuickLinks -- Click here to rapidly navigate through this document

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 6-K

Report of Foreign Private Issuer

Pursuant to Rule 13a-16 or 15d-16
of the Securities Exchange Act of 1934

Date: March 19, 2009
Commission File Number 001-31528

IAMGOLD Corporation
(Translation of registrant's name into English)

401 Bay Street Suite 3200, PO Box 153
Toronto, Ontario, Canada M5H 2Y4
Tel: (416) 360-4710
(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    o             Form 40-F     ý     

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):                              



INCORPORATION BY REFERENCE

Exhibit 3.1.1 to this Form 6-K is hereby incorporated by reference as an exhibit into the registration statement on Form F-10 of IAMGOLD Corporation (File No. 333-157782).

Description of Exhibit

Exhibit
 
Description of Exhibit
3.1.1   Amending Agreement to the Underwriting Agreement dated March 17, 2009


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.


 

 

IAMGOLD CORPORATION

Date: March 19, 2009

 

By:

 

/s/ PAUL OLMSTED

Paul B. Olmsted
Senior Vice-President, Corporate Development



QuickLinks

INCORPORATION BY REFERENCE
Signatures