Nguyễn Ngọc Thơ, Vietnamese politician, 1st Prime Minister of the Republic of Vietnam (died 1976)

Nguyễn Ngọc Thơ was a South Vietnamese politician who was the first vice president of South Vietnam, serving under President Ngô Đình Diệm from 1956 until Diệm's overthrow and assassination in 1963. He also served as the first prime minister of South Vietnam, serving from November 1963 to late January 1964. Thơ was appointed to head a civilian cabinet by the military junta of General Dương Văn Minh, which came to power after overthrowing and assassinating Diệm, the nation's first president. Thơ's rule was marked by a period of confusion and weak government, as the Military Revolutionary Council (MRC) and the civilian cabinet vied for power. Thơ lost his job and retired from politics when Minh's junta was deposed in a January 1964 coup by General Nguyễn Khánh.

This is a list of leaders of South Vietnam, since the establishment of the Autonomous Republic of Cochinchina in 1946, and the division of Vietnam in 1954 until the fall of the Republic of Vietnam in 1975, and the reunification of Vietnam in 1976.