2022 United States Senate election in South Dakota

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 is 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.

Republican primary
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.

Nominee

 * John Thune, incumbent U.S. Senator (2005–present) and Senate Minority Whip (2021–present)

Eliminated in primary

 * Mark Mowry, musician and rancher
 * Bruce Buffalo Dreamer Whalen, Oglala Sioux tribal administrator, former chair of the Oglala Lakota County Republican Party, and nominee for SD's at-large congressional district in 2006

Withdrew

 * Patrick Schubert, software executive

Declined

 * Marty Jackley, former South Dakota Attorney General (2009–2019) and candidate for Governor of South Dakota in 2018 (ran for Attorney General)
 * Dusty Johnson, U.S. Representative from SD's at-large congressional district (2019–present) (ran for re-election)
 * Kristi Noem, Governor of South Dakota (2019–present) and former U.S. Representative for SD's at-large congressional district (2011–2019) (ran for re-election)

Results
[[File:2022 United States Senate Republican primary election in South Dakota results map by county.svg|thumb|Results by county {{legend|#E27F7F|Thune}}

{{legend|#E27F7F|50–60%}}

{{legend|#D75D5D|60–70%}}

{{legend|#D72F30|70–80%}}

{{legend|#C21B18|80–90%}} ]]

Nominee

 * Brian Bengs, U.S. Navy and Air Force veteran, and former Northern State University political science professor

Declined

 * Troy Heinert, Minority Leader of the South Dakota Senate (2019–present) from the 26th district (2015–present)
 * Brendan Johnson, former U.S. Attorney for South Dakota (2009–2015) and son of former U.S. Senator Tim Johnson
 * Stephanie Herseth Sandlin, president of Augustana University (2017–present) and former U.S. Representative for SD's at-large congressional district (2004–2011)
 * Billie Sutton, former Minority Leader of the South Dakota Senate (2015–2019) from the 21st district (2011–2019) and nominee for governor in 2018

Nominee

 * Tamara Lesnar, small business owner