Nguy?n Bá C?n (9 September 1930, in C?n Tho – 20 May 2009, in San Jose, California) was Prime Minister of South Vietnam from 4 April 1975 until 24 April 1975; serving under Presidents Nguy?n Van Thi?u (4 April to 21 April) and Tr?n Van Huong (21 April to 24 April).