The 1974 United States Senate election in Vermont took place on November 5, 1974. The incumbent Republican Senator, George Aiken, did not run for re-election to another term in the United States Senate. The Democratic nominee, Patrick Leahy, the state's attorney of Chittenden County, defeated Republican nominee, Rep. Richard W. Mallary, to become Aiken's successor. This election also included Liberty Union Party candidate Bernie Sanders, who won 4.1% of the vote.