The 1964 United States Senate special election in Tennessee was held on November 3, 1964, concurrently with the U.S. presidential election as well the other regularly scheduled U.S. Senate election, as well as other elections to the United States Senate in other states as well as elections to the United States House of Representatives and various state and local elections. Following the death of Senator Estes Kefauver, Governor Frank G. Clement appointed Herbert S. Walters to fill the vacancy until the special election could take place. Walters decided not to run in the special election. Democratic nominee Ross Bass won the election, defeating Republican Howard Baker with 52.1% of the vote.
In the primary, Bass defeated Governor Clement by almost 15 points.
29.4% of the voting age population participated in the Democratic primary.
5% of the voting age population participated in the Republican primary.