The 1916 United States Senate election in Washington was held on November 7, 1916. Incumbent Republican Miles Poindexter was for a second term in office over Democratic former Senator George Turner and Socialist Bruce Rogers.
Poindexter: 40–50% 50–60% 60–70%
Turner: 40–50% 50–60%
- Mrs. John B. Allen, widow of the late Senator John B. Allen
- Enoch Albert Bryan, president of Washington State College
- Schuyler Duryee
- William E. Humphrey, U.S. Representative from Seattle
- Miles Poindexter, incumbent U.S. Senator since 1911
- William Alvin Spalding
|Republican||Miles Poindexter (incumbent)||106,778||28.94%|
|Republican||William E. Humphrey||95,694||25.93%|
|Republican||Enoch Albert Bryan||83,769||22.70%|
|Republican||Mrs. John B. Allen||38,421||10.41%|
|Republican||William Alvin Spalding||22,688||6.15%|
- Robert Bridges, Commissioner of the Port of Seattle
- George Turner, former U.S. Senator (1897–1903)
- Walter J. Thompson
Thompson was unopposed for the Progressive nomination.
|Progressive||Walter J. Thompson||296||100.00%|
|Republican||Miles Poindexter (incumbent)||202,287||55.39%|
|Prohibition||Joseph A. Campbell||4,411||1.21%|
|Progressive||Walter J. Thompson||1,442||0.40%|
|Democratic gain from Republican|
- "Elections Search Results: September 1916 Primary". Washington Secretary of State. Retrieved 20 Mar 2022.
- "The Original "Year of the Woman"". house.gov. 30 Jan 2017. Retrieved 20 Mar 2022.
- "Statistics of the Presidential and Congressional Election of November 7, 1916" (PDF). U.S. Government Printing Office. Retrieved 19 Mar 2022.