The United States Senate election of 1946 in Connecticut was held on November 5, 1946.
In the previous election, Francis T. Maloney had been re-elected to the seat; however, Maloney died on January 16, 1945. Former Admiral Thomas C. Hart was appointed to serve in his place as Senator; Hart did not stand for election.
Republican Party (US) Candidate Raymond E. Baldwin, the incumbent governor of the state, defeated his principal opponent, Democratic Party candidate, Joseph M. Tone, who had been an Assistant Secretary of Labor under President Franklin Roosevelt.
Senator Hart resigned on November 5, 1946, and Baldwin assumed the seat on December 27, 1946. Senator Baldwin resigned in December, 1949 to become a justice of Connecticut's Supreme Court of Errors.