| South Dakota Republican Party | |
| Colorcode: |
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| Chairperson: | John Wiik |
| Leader1 Title: | Senate Leader |
| Leader1 Name: | Kris Langer |
| Leader2 Title: | House Leader |
| Leader2 Name: | Lee Qualm |
| Colors: | Red, White, Blue |
| Seats1 Title: | Seats in the Senate |
| Seats2 Title: | Seats in the House |
| Seats3 Title: | Statewide Offices |
| Membership Year: | 2021 |
| Membership: | 279,921[1] |
| National: | Republican Party |
| Headquarters: | P.O. Box 1099. Pierre, South Dakota 57501[2] |
| Website: | South Dakota GOP |
| State: | South Dakota |
The South Dakota Republican Party is the affiliate of the Republican Party in South Dakota. It is currently the dominant party in the state, controlling South Dakota's at-large U.S. House seat, both U.S. Senate seats, the governorship, and has supermajorities in both houses of the state legislature. State Sen. John Wiik has served as the party's chairman since 2023.[3]
The South Dakota Republican Party controls all ten statewide offices and holds majorities in the South Dakota Senate and the South Dakota House of Representatives. Republicans also hold both of the state's U.S. Senate seats and the state's at-large congressional seat.
| At-large |
| 1994 | Bill Janklow | 172,515 | 55.4% | Won |
| 1998 | Bill Janklow | 166,621 | 64.0% | Won |
| 2002 | Mike Rounds | 189,920 | 56.8% | Won |
| 2006 | Mike Rounds | 206,990 | 61.7% | Won |
| 2010 | Dennis Daugaard | 195,024 | 61.51% | Won |