The 1936 South Carolina United States House of Representatives elections were held on November 2, 1936, to select six Representatives for two-year terms from the state of South Carolina. All five incumbents who ran were re-elected and the open seat in the 4th congressional district was retained by the Democrats. The composition of the state delegation thus remained solely Democratic.
There was a split in the South Carolina Republican Party between the Tolbert and Seabrook factions because each side wanted to be the arbiter of the spoils system should a national Republican victory occur. Therefore, they both offered their own slate of candidates for the federal contests and they were competing against each other, not the Democrats, to show the national Republican Party that they held more sway in the state.
Incumbent Democratic Congressman John J. McSwain of the 4th congressional district died on August 6, 1936, and a special election was called for November 3 to be held simultaneously with the regular election. The South Carolina Democratic Party held a primary election that would choose their candidate for both the special and regular election. Gabriel H. Mahon, Jr. won the primary and was unopposed in the special election to serve out the remainder of the term.
Jordan, Frank E. The Primary State: A History of the Democratic Party in South Carolina, 1876-1962. pp. 106, 111, 120, 124.
"Supplemental Report of the Secretary of State to the General Assembly of South Carolina." Reports of State Officers Boards and Committees to the General Assembly of the State of South Carolina. Volume I. Columbia, SC: 1937, pp. 7–9.