The 2022 United States Senate election in South Dakota was held on November 8, 2022, to elect a member of the United States Senate to represent the State of South Dakota. Incumbent three-term Republican U.S. Senator John Thune, who was the Senate Minority Whip, was first elected in 2004, defeating Democratic incumbent Tom Daschle, the then-Senate Minority Leader. He ran for reelection to a fourth term. The Democratic nominee was 26-year Navy, Air Force JAG Corps veteran, and former college professor Brian Bengs. Thune was ultimately reelected, becoming the first Senator from South Dakota to be elected to a fourth term since Karl Mundt in 1966, and only the second to do so after Mundt.
On December 23, 2020, then-President Donald Trump said Thune would face a primary challenger after Thune refused to support a challenge of the 2020 Electoral College results, tweeting: "Republicans in the Senate so quickly forget. Right now they would be down 8 seats without my backing them in the last Election. RINO John Thune, 'Mitch's boy', should just let it play out. South Dakota doesn't like weakness. He will be primaried in 2022, political career over!!!" South Dakota Governor Kristi Noem stated she would not challenge Thune for the seat. On January 1, 2021, Trump tweeted that Noem should challenge Thune in a primary, despite Noem previously saying she would not do so, instead running for re-election as Governor in 2022.
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