The United States District Court for the Western District of Washington (in case citations, W.D. Wash.) is the Federal district court whose jurisdiction comprises the following counties: Clallam, Clark, Cowlitz, Grays Harbor, Island, Jefferson, King, Kitsap, Lewis, Mason, Pacific, Pierce, San Juan, Skagit, Skamania, Snohomish, Thurston, Wahkiakum, and Whatcom.

As of the 2000 census, 4.6 million people resided in the Western District, representing 78% of the state's population. The district includes the cities of Bellingham, Seattle, and Tacoma, amongst others.

Cases from the Western District of Washington are appealed to the United States Court of Appeals for the Ninth Circuit (except for patent claims and claims against the U.S. government under the Tucker Act, which are appealed to the Federal Circuit).

The United States Attorney's Office for the Western District of Washington represents the United States in civil and criminal litigation in the court. The United States Attorney for the district is Jenny Durkan.

Judges