| Election Name: | 1990 United States Senate election in South Dakota |
| Country: | South Dakota |
| Flag Year: | 1963 |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1984 United States Senate election in South Dakota |
| Previous Year: | 1984 |
| Election Date: | November 6, 1990 |
| Next Election: | 1996 United States Senate election in South Dakota |
| Next Year: | 1996 |
| Image1: | Larry Pressler 1989.jpg |
| Nominee1: | Larry Pressler |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 135,682 |
| Percentage1: | 52.39% |
| Map Size: | 260px |
| U.S. Senator | |
| Before Election: | Larry Pressler |
| Before Party: | Republican Party (United States) |
| After Election: | Larry Pressler |
| After Party: | Republican Party (United States) |
| Nominee2: | Ted Muenster |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 116,727 |
| Percentage2: | 45.07% |
The 1990 United States Senate election in South Dakota was held on November 6, 1990. Incumbent Republican U.S. Senator Larry Pressler ran for re-election to a third term, beating Democratic nominee Theodore 'Ted' Muenster by 19,000 votes. This was the last time until 2014 that a Republican would be elected to South Dakota's Class 2 Senate seat.
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