International Paper (IP) S-3ASR Automatic shelf registration

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this Registration Statement on Form S-3 of our reports dated March 2, 2006 relating to the consolidated financial statements and financial statement schedule of International Paper Company, and management’s report on the effectiveness of internal control over financial reporting appearing in and incorporated by reference in the Annual Report on Form 10-K/A of International Paper Company for the year ended December 31, 2005 and to the reference to us under the heading “Experts” in the Prospectus, which is part of this Registration Statement.

/s/ Deloitte & Touche LLP

New York, N.Y.

March 2, 2006