Nguyễn Bá Cẩn was a South Vietnamese politician who served as the penultimate Prime Minister of South Vietnam from 4 April 1975 until 28 April 1975, serving under Presidents Nguyễn Văn Thiệu and Trần Văn Hương. Before becoming prime minister, he was a member of the lower house of the National Assembly representing Định Tường province and served as the second Speaker of the lower house.

Nguyễn Văn Thiệu was a South Vietnamese military officer and politician who was the president of South Vietnam from 1967 to 1975. He was a general in the Republic of Vietnam Armed Forces (RVNAF), became head of a military junta in 1965, and then president after winning a rigged election in 1967. He established rule over South Vietnam until he resigned and left the nation and relocated to Taipei a few days before the fall of Saigon and the ultimate North Vietnamese victory.