EX-23 4 ex231.htm CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM Exhibit 23

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in this Registration Statement on Form S‑8 of our report dated March 16, 2005 relating to the financial statements, management's assessment of the effectiveness of internal control over financial reporting and the effectiveness of internal control over financial reporting, which appears in the 2004 Annual Report to Shareholders of Alcan Inc., which is incorporated by reference in Alcan Inc.'s Annual Report on Form 10‑K for the year ended December 31, 2004. 

Montreal, Quebec, Canada

September 29, 2005