The 1970 South Carolina United States House of Representatives elections were held on November 3, 1970 to select six Representatives for two-year terms from the state of South Carolina. The primary elections were held on June 9 and the runoff elections were held two weeks later on June 23. All five incumbents who ran were re-elected and the open seat in the 2nd district was retained by the Republicans. The composition of the state delegation remained five Democrats and one Republican.
Incumbent Democratic Congressman John L. McMillan of the 6th congressional district, in office since 1939, won the Democratic primary and defeated Republican Edward B. Baskin in the general election.