- Source: 1918 United States Senate special election in Missouri
- 1918 United States Senate special election in Missouri
- 2002 United States Senate special election in Missouri
- 1918 United States Senate elections
- 2006 United States Senate election in Missouri
- 2018 United States Senate election in Missouri
- 2022 United States Senate election in Missouri
- 2020–21 United States Senate special election in Georgia
- 2000 United States Senate election in Missouri
- 1918 United States House of Representatives elections
- List of special elections to the United States Senate
The 1918 United States Senate special election in Missouri took place on November 5, 1918 in Missouri. Democrat William J. Stone was elected to the full term in 1914, but died on April 14, 1918. Xenophon P. Wilfley was appointed to the vacant seat on April 30, 1918. He lost the Democratic primary election to Joseph W. Folk, who was defeated by Republican Selden P. Spencer in the general election.
Democratic primary
= Candidates
=Joseph W. Folk, former governor of Missouri
Xenophon P. Wilfley, the incumbent Senator
John C. Higdon, lawyer
= Results
=Republican primary
= Candidates
=Selden P. Spencer, former circuit court judge and former state representative for the St. Louis City-5th district
Jay L. Torrey, Rough Rider and former Speaker of the Wyoming House of Representatives