Elections to the South Dakota Senate were held on November 3, 2020 as a part of the biennial elections in the U.S. state of South Dakota. Voters in 35 single-member constituencies elected members to the 93rd Senate. Elections were also held in the state for U.S. president, the U.S. Senate, the U.S. House, and the South Dakota House of Representatives. Primary elections were held on June 2, 2020.