The prime minister of the Republic of Korea is the deputy head of government and the second highest political office of South Korea who is appointed by the President of the Republic of Korea, with the National Assembly's approval. The prime minister may be a member of the National Assembly, but this is not required to hold the office. The prime minister of South Korea is not the head of government of South Korea, for the President is both the head of state and government in the country.

The president of the Republic of Korea, also known as the president of South Korea (Korean: 대통령), is the head of state and head of government of the Republic of Korea. The president leads the State Council, and is the chief of the executive branch of the national government as well as the commander-in-chief of the Republic of Korea Armed Forces.