1940 United States Senate election in California

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1940 United States Senate election in California
	County results ; Johnson: 70-80% 80-90% >90%
U.S. senator before election; Hiram Johnson; Republican	Elected U.S. Senator ; Hiram Johnson; Republican

The United States Senate election in California of 1940 was held on November 5, 1940. Incumbent Republican Senator Hiram Johnson was re-elected to his fifth term in office, though he would die in office in 1945.

By cross-filing and winning the Democratic and Progressive primaries, Johnson eliminated his strongest competition and handily won the general election with only nominal opposition from the Prohibition Party.