<br /><br /> In South Vietnam, the Premier leaders of the First Republic of South Vietnam were: Ngo Dinh Diem, President, Nguyen Ngoc Tho, Vice President. In the Second Republic of South Vietnam were: Nguyen Van Thieu, President, Nguyen Cao Ky, vice President, Ngo Quang Truong, General of the first Division. The Last president of South Vietnam was Duong Van Minh.