Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (No. 333-111269 and No. 333-120703) and Form S-8 (No. 333-56670) of Seattle Genetics, Inc. of our report dated March 11, 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 appear in this Form 10-K.

PRICEWATERHOUSECOOPERS LLP

Seattle, Washington

March 11, 2005