The 2004 Washington State Auditor election was held on November 2, 2004, to elect the Washington State Auditor, concurrently with the 2004 U.S. presidential election, as well as elections to the U.S. Senate and various state and local elections, including for U.S. House and governor of Washington. Primary elections took place on September 14.
Four-term incumbent Democratic State Auditor Brian Sonntag was re-elected to his fourth term in office, defeating Republican perennial candidate Will Baker with 64% of the vote.