The 1974 United States Senate election in South Dakota was held on November 5, 1974. Incumbent Democratic U.S. Senator George McGovern ran for reelection to a third term and won.
McGovern's reelection was notable for the fact two years prior, in the 1972 presidential election, McGovern lost his home state by 9 points to Richard Nixon, yet won his Senate reelection bid by 7 points, marking a sixteen point swing in two years.
Primary elections were held on June 4, 1974.