Presidential and vice- presidential elections were held in South Korea on 20 July 1948, following the Constitutional Assembly elections in May. The president was to be elected by the members of the National Assembly, as instructed by the 1948 Constitution. Of the 198 members of the National Assembly, 196 were present for the vote. A candidate required two-thirds of the votes cast to win. Syngman Rhee was elected with 180 votes, and took over the government to oversee the transfer of power from the United States Army Military Government in Korea.

The United States Army Military Government in Korea (USAMGIK) was the official ruling body of the Southern half of the Korean Peninsula from 8 September 1945 to 15 August 1948.