| Election Name: | 1984 United States Senate election in South Dakota |
| Country: | South Dakota |
| Flag Year: | 1963 |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1978 United States Senate election in South Dakota |
| Previous Year: | 1978 |
| Next Election: | 1990 United States Senate election in South Dakota |
| Next Year: | 1990 |
| Election Date: | November 6, 1984 |
| Image1: | File:Larry Pressler 1989.jpg |
| Nominee1: | Larry Pressler |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 235,176 |
| Percentage1: | 74.49% |
| Nominee2: | George V. Cunningham |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 80,537 |
| Percentage2: | 25.51% |
| 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) |
The 1984 United States Senate election in South Dakota was held on November 6, 1984. Incumbent Republican Senator Larry Pressler was easily re-elected to a second term.[1]