The first president of Southern Vietnam was Ngo Dinh Diem. But as I said, he was the first. I think there is another post on here that has that same question, so good luck, and sorry I can't give any more information!
ANSWER Ho Chi Minh was the president of North Vietnam during the Vietnam War his original name was Nguyen Tat. Diem was the president of South Vietnam. Diem was assassinated Nguyen Van Thien was the president of South Vietnam after him.
The Vietnam war ended in 1975, Gerald Ford was president.
It was Richard Nixon.
Diem & Thieu
Ford was President when South Vietnam fell to the communists (North Vietnam).
Diem, later Thieu.
First Diem, later Thieu
At the time of the Vietnam War, North Vietnam was led by Ho Chi Minh, who was the founder of the Democratic Republic of Vietnam. South Vietnam was led by President Ngo Dinh Diem until 1963 when he was overthrown and later by Nguyen Van Thieu.
The president of South Vietnam at the end of the war was Nguyen Van Thieu.
After the Geneva Conventions in 1954 Vietnam was split into two, North Vietnam (communists) and South Vietnam (democrats). The leader of the North was Ho Chi Minh. The leader of the South was Prime Minister Ngo Dinh Diem, who was later elected president of South Vietnam; and overthrown by his own general in a coup d'tat in 1963. Nguyen Van Thieu took over, as leader of South Vietnam, for the remainder of the war.
The president of the USA for a major time of the Vietnam War was Lyndon Johnson.
Ho Chi Mihn