- Source: 1920 United States Senate election in Missouri
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The 1920 United States Senate election in Missouri took place on November 2, 1920 in Missouri. The incumbent Republican Senator, Selden P. Spencer, was re-elected to a full term, having won a special election in 1918. He defeated Breckinridge Long of the Democratic Party. Spencer underperformed Republican presidential nominee Warren G. Harding, who won 54.6% of the vote in the concurrent presidential election.
Democratic primary
= Candidates
=Charles M. Hay, former State Representative for Callaway County
John C. Higdon, lawyer
Arthur N. Lindsey, pastor
Breckinridge Long, former Assistant Secretary of State
George H. Scruton, editor of the Sedalia Democrat
Henry Samuel Priest, former judge for the United States District Court for the Eastern District of Missouri
= Results
=Republican primary
= Candidates
=Dwight F. Davis, adjutant and former Olympic tennis player
James L. Minnis, former attorney
Selden P. Spencer, the incumbent Senator
= Results
=Other candidates
= Farmer–Worker
=The Farmer–Worker Party nominated carpenter W. J. Mallett.
= Socialist
== Socialist Labor
=The Socialist Labor Party nominated Andrew Trudell.