| Election Name: | 1970 United States Senate election in Mississippi |
| Country: | Mississippi |
| Flag Image: | Flag of Mississippi (1894-1996).svg |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1964 United States Senate election in Mississippi |
| Previous Year: | 1964 |
| Election Date: | November 3, 1970 |
| Next Election: | 1976 United States Senate election in Mississippi |
| Next Year: | 1976 |
| Nominee1: | John C. Stennis |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 286,622 |
| Percentage1: | 88.40% |
| Nominee2: | William Richard Thompson |
| Party2: | Independent (United States) |
| Popular Vote2: | 37,593 |
| Percentage2: | 11.60% |
| Map Size: | 255px |
| U.S. Senator | |
| Before Party: | Democratic Party (US) |
| After Party: | Democratic Party (US) |
The 1970 United States Senate election in Mississippi was held on November 3, 1970. Incumbent Democratic U.S. Senator John C. Stennis won re-election to his fifth term, easily defeating independent candidate William Richard Thompson.
This race would be one of only two races where Stennis would face a general election challenger; as in his other races he had no general election opposition.