The 1920 United States Senate special election in Missouri took place on November 5, 1918 in
Missouri.
DemocratWilliam 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
RepublicanSelden P. Spencer in the general election.