越南国
The 1955 State of Vietnam referendum determined the future form of government of the State of Vietnam, the nation that was to become the Republic of Vietnam (widely known as South Vietnam). It was contested by Prime Minister Ngô Đình Diệm, who proposed a republic, and former emperor Bảo Đại, who had abdicated in 1945 and at the time of the referendum held the title of head of state.