The William Kenzo Nakamura United States Courthouse is a federal courthouse in Seattle, Washington primarily used by the United States Court of Appeals for the Ninth Circuit. Built in 1940 as the United States Courthouse to consolidate federal agencies within the city, it was renamed for Medal of Honor recipient William K. Nakamura in 2001. The Ninth Circuit started using the building in the 1970s and became the principal tenant in 2004 when most other users moved to the new 23-story United States Courthouse in the Denny Triangle.