| Election Name: | 1968 United States Senate election in South Dakota |
| Country: | South Dakota |
| Flag Year: | 1963 |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1962 United States Senate election in South Dakota |
| Previous Year: | 1962 |
| Next Election: | 1974 United States Senate election in South Dakota |
| Next Year: | 1974 |
| Election Date: | November 5, 1968 |
| Image1: | McGovern campaign portrait (cropped).jpg |
| Nominee1: | George McGovern |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 158,961 |
| Percentage1: | 56.79% |
| Nominee2: | Archie M. Gubbrud |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 120,951 |
| Percentage2: | 43.21% |
| Map Size: | 260px |
| U.S. Senator | |
| Before Election: | George McGovern |
| Before Party: | Democratic Party (United States) |
| After Election: | George McGovern |
| After Party: | Democratic Party (United States) |
The 1968 United States Senate election in South Dakota took place on November 5, 1968. Incumbent Democratic Senator George McGovern ran for re-election to a second term. He was challenged by former Governor Archie M. Gubbrud, who was persuaded to enter the race by the South Dakota Republican establishment.[1] McGovern defeated Gubbrud by a wide margin, even as Richard Nixon was defeating Hubert Humphrey in the state's presidential election in a landslide.
Both McGovern and Gubbrud were unopposed in their respective primaries.[2] Gubbrud and incumbent Governor Nils Boe were seen as likely Republican candidates, but on March 22, Boe announced that he would not run.[3] Shortly thereafter, a grassroots group of Republicans supportive of Gubbrud, named "Archie's Archers," started a campaign to persuade him to run, and received promises from other potential Republican candidates that they wouldn't run if Gubbrud did.[4] On April 7, Gubbrud announced that he would run for the Senate,[5] and subsequently received endorsements from prominent Republican figures, including former Vice-President Richard Nixon.[6]