**Exhibit 31.2**

**CERTIFICATION**

I, Michael Hanley, Executive VicePresident and Chief Financial Officer of Alcan Inc. (''Alcan''), certify that:

1.     I have reviewed this annual report on Form 10‐K of Alcan;

2.     Based on my knowledge, this report does not contain any untrue statementof a material fact or omit to state a material fact necessary to make thestatements made, in light of the circumstances under which such statements weremade, not misleading with respect to the period covered by this report;

3.     Based on my knowledge, the financial statements, and other financialinformation included in this report, fairly present in all material respects thefinancial condition, results of operations and cash flows of the registrant asof, and for, the periods presented in this report;

4.     The registrant's other certifying officer and I are responsible forestablishing and maintaining disclosure controls and procedures (as defined inExchange Act Rules 13a‐15(e) and 15d‐15(e)) and internal control over financialreporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for theregistrant and have:

a)   Designedsuch disclosure controls and procedures, or caused such disclosure controls andprocedures to be designed under our supervision, to ensure that materialinformation relating to the registrant, including its consolidated subsidiaries,is made known to us by others within those entities, particularly during theperiod in which this report is being prepared;

b)   Designedsuch internal control over financial reporting, or caused such internal controlover financial reporting to be designed under our supervision, to providereasonable assurance regarding the reliability of financial reporting and thepreparation of financial statements for external purposes in accordance withgenerally accepted accounting principles;

c)   Evaluatedthe effectiveness of the registrant's disclosure controls and procedures andpresented in this report our conclusions about the effectiveness of thedisclosure controls and procedures, as of the end of the period covered by thisreport based on such evaluation; and

d)   Disclosedin this report any change in the registrant's internal control over financialreporting that occurred during the registrant's most recent fiscal quarter (theregistrant's fourth fiscal quarter in the case of an annual report) that hasmaterially affected, or is reasonably likely to materially affect, theregistrant's internal control over financial reporting; and

5.     The registrant's other certifying officer and I have disclosed, based onour most recent evaluation of internal control over financial reporting, to theregistrant's auditors and the audit committee of registrant's board of directors(or persons performing the equivalent function):

a)   Allsignificant deficiencies and material weaknesses in the design or operation ofinternal control over financial reporting which are reasonably likely toadversely affect the registrant's ability to record, process, summarize andreport financial information; and

b)   Any fraud,whether or not material, that involves management or other employees who have asignificant role in the registrant's internal control over financial reporting.

 

Date: 8 March 2006                                                          

                                                                                                                                     /s/Michael Hanley                                                                                                                                                                MichaelHanley

                                                                                                                                      ExecutiveVice President and 

                                                                                                                                      ChiefFinancial Officer