| Election Name: | 1926 United States Senate election in South Dakota |
| Country: | South Dakota |
| Flag Year: | 1909 |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1920 United States Senate election in South Dakota |
| Previous Year: | 1920 |
| Next Election: | 1932 United States Senate election in South Dakota |
| Next Year: | 1932 |
| Election Date: | November 2, 1926 |
| Nominee1: | Peter Norbeck |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 105,756 |
| Percentage1: | 59.52% |
| Nominee2: | Charles J. Gunderson |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 59,128 |
| Percentage2: | 33.28% |
| Nominee3: | Howard Platt |
| Party3: | Farmer–Labor Party |
| Popular Vote3: | 12,797 |
| Percentage3: | 7.20% |
| Map Size: | 240px |
| U.S. Senator | |
| Before Election: | Peter Norbeck |
| Before Party: | Republican Party (United States) |
| After Election: | Peter Norbeck |
| After Party: | Republican Party (United States) |
The 1926 United States Senate election in South Dakota took place on November 2, 1926. Incumbent Republican Senator Peter Norbeck ran for re-election to a second term. In the Republican primary, he faced former State Senator George J. Danforth, who had the support of Governor Carl Gunderson in an intra-party split between Norbeck and Gunderson.[1] Norbeck defeated Danforth by a wide margin, and then faced former State Representative Charles J. Gunderson in the general election. Norbeck defeated Gunderson in a landslide to win re-election.
Former State Representative Charles J. Gunderson[2] won the Democratic nomination unopposed.[3]