The 2020 United States Senate election in Tennessee was held on November 3, 2020, concurrently with other elections to the United States Senate. The 2020 U.S. presidential election and elections to the U.S. House of Representatives were also held, as well as the State Senate and State House elections. Incumbent Republican Senator Lamar Alexander announced that he would not run for re-election on December 17, 2018. The former United States Ambassador to Japan, Bill Hagerty won the open seat by a large margin defeating his Democratic opponent Marquita Bradshaw.

The 2020 Tennessee State Senate election was held on November 3, 2020, to elect 16 of the 33 seats for the Tennessee's State Senate. The elections coincided with the Presidential, U.S. Senate, U.S. House, and State House elections. The primary elections were held on August 6, 2020, with the exception of presidential primaries held on March 3 of that year.