1946 United States Senate election in Washington

The 1946 United States Senate election in Washington was held on November 5, 1946. Incumbent Democrat Hugh Mitchell, who had been appointed to fill the unexpired term of Monrad Wallgren, ran for a full term in office, but was defeated by Republican Mayor of Tacoma Harry Cain.

Democratic

 * Sam C. Herren
 * Russell Fluent, Washington State Treasurer
 * Hugh Mitchell, interim U.S. Senator since 1945

Republican

 * Harry Cain, Mayor of Tacoma
 * J. Parkhurst Douglass