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.

1970 United States Senate election in Mississippi

← 1964 November 3, 1970 1976 →

Nominee John C. Stennis William Richard Thompson Party Democratic Independent Popular vote 286,622 37,593 Percentage 88.40% 11.60%

County results Stennis:      50–60%      60–70%      70–80%      80–90%      >90%

U.S. senator before election John C. Stennis Democratic Elected U.S. Senator John C. Stennis Democratic

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.