Marais Viljoen, South African politician, 5th State President of South Africa (born 1915)

Marais Viljoen, was the last ceremonial State President of South Africa from 4 June 1979 until 3 September 1984. Viljoen became the last of the ceremonial presidents of South Africa when he was succeeded in 1984 by Prime Minister P. W. Botha, who combined the offices into an executive state presidency.

The state president of the Republic of South Africa was the head of state of South Africa from 1961 to 1994. The office was established when the country became a republic on 31 May 1961, outside the Commonwealth of Nations, and Queen Elizabeth II ceased to be Queen of South Africa. The position of Governor-General of South Africa was accordingly abolished. From 1961 to 1984, the post was largely ceremonial. After constitutional reforms enacted in 1983 and taking effect in 1984, the State President became an executive post, and its holder was both head of state and head of government.

January 4 is the fourth day of the year in the Gregorian calendar; 361 days remain until the end of the year.