| Election Name: | 1990 United States Senate election in Mississippi |
| Country: | Mississippi |
| Flag Image: | Flag of Mississippi (1894-1996).svg |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1984 United States Senate election in Mississippi |
| Previous Year: | 1984 |
| Election Date: | November 6, 1990 |
| Next Election: | 1996 United States Senate election in Mississippi |
| Next Year: | 1996 |
| Image1: | Thad Cochran official photo (cropped).jpg |
| Nominee1: | Thad Cochran |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 274,244 |
| Percentage1: | 100.00% |
| Map Size: | 255px |
| U.S. Senator | |
| Before Election: | Thad Cochran |
| Before Party: | Republican Party (United States) |
| After Election: | Thad Cochran |
| After Party: | Republican Party (United States) |
The 1990 United States Senate election in Mississippi was held on November 6, 1990. Incumbent Republican U.S. Senator Thad Cochran won re-election to a third term.[1] The Democratic Party did not field a candidate for this election.