Elections held in the state of Washington on November 6, 2012. A nonpartisan blanket primary was held on August 7, 2012.

In this election, Washington had 12 electors to the Electoral College. Incumbent Democratic president Barack Obama safely carried the state, gaining all 12 electoral votes against Republican nominee Mitt Romney.

Incumbent Democratic senator Maria Cantwell won re-election to a third term against Republican state senator Michael Baumgartner.

Due to the results of the 2010 United States census, Washington elected U.S. Representatives from ten congressional districts, a gain of one seat.

Incumbents Rick Larsen (D-2nd), Jaime Herrera Beutler (R-3rd), Doc Hastings (R-4th), Cathy McMorris Rodgers (R-5th), Jim McDermott (D-7th), Dave Reichert (R-8th), and Adam Smith (R-9th) ran for re-election and won. Incumbents Jay Inslee (D-1st) and Norman D. Dicks (D-6th) retired and were respectively succeeded by Suzan DelBene (D) and Derek Kilmer (D). Denny Heck (D) was elected to the newly created 10th district.

The resulting composition was six Democrats and four Republicans.

Incumbent Democratic governor Christine Gregoire declined to run for a third term. Democratic congressman Jay Inslee ran to succeed her, earning Gregoire's endorsement. He faced Republican attorney general Rob McKenna in the general election, defeating him by a small margin.

Incumbent Democratic lieutenant governor Brad Owen ran for re-election to a fifth term.