The 1934 United States Senate election in Washington was held on November 6, 1934. Incumbent Democrat Clarence Dill did not run for a third term in office. He was succeeded by Democrat Lewis Schwellenbach, who defeated Republican Reno Odlin for the open seat.

Clarence Cleveland Dill was an American politician from the state of Washington. A Democrat, he was elected to two terms each in both houses of Congress.