According to South African History Online, there is no prime minister of South Africa. The post of prime minister was abolished in South Africa in 1984.
"State president" became an official post in 1984, taking the place of the prime minister post, and the title was changed to just "president" in 1994. The last prime minister of South Africa was Pieter Willem Botha, who served two terms from Oct. 9, 1978, to Sept. 3, 1984. Botha was a member of the National Party, and served as the 18th and 19th prime minister of South Africa. As of 2014, the current president of South Africa is Jacob Zuma, whose term began in 2009. Zuma is a member of the African National Congress party.