South Africa: Heads of State: 1961-1994 - Archontology
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South Africa: Heads of State: 1961-1994

The Constitutions of 1961 and 1983 (effective 1961-1994) refer to the office exclusively as State President (in English) and Staatspresident (in Afrikaans).
State President of the Republic of South Africa :: Staatspresident van die Republiek van Suid-Afrika
31 May 1961 - 31 May 1967 Charles Swart 
Acting State President of the Republic of South Africa :: Waarnemende Staatspresident van die Republiek van Suid-Afrika
1 Jun 1967 - 10 Apr 1968 Jozua François Naudé [1]
State President of the Republic of South Africa :: Staatspresident van die Republiek van Suid-Afrika
10 Apr 1968 - 9 Apr 1975 Jim Fouché
Acting State President of the Republic of South Africa :: Waarnemende Staatspresident van die Republiek van Suid-Afrika
10 Apr 1975 - 19 Apr 1975 Johannes de Klerk
State President of the Republic of South Africa :: Staatspresident van die Republiek van Suid-Afrika
19 Apr 1975 - 21 Aug 1978 Nicolaas Diederichs
Acting State President of the Republic of South Africa :: Waarnemende Staatspresident van die Republiek van Suid-Afrika
21 Aug 1978 - 10 Oct 1978 Marais Viljoen [2]
State President of the Republic of South Africa :: Staatspresident van die Republiek van Suid-Afrika
10 Oct 1978 - 4 Jun 1979 Balthazar Johannes Vorster
Acting State President of the Republic of South Africa :: Waarnemende Staatspresident van die Republiek van Suid-Afrika
4 Jun 1979 - 19 Jun 1979 Marais Viljoen 
State President of the Republic of South Africa :: Staatspresident van die Republiek van Suid-Afrika
19 Jun 1979 - 3 Sep 1984 Marais Viljoen 
Acting State President of the Republic of South Africa :: Waarnemende Staatspresident van die Republiek van Suid-Afrika
3 Sep 1984 - 14 Sep 1984 Pieter Willem Botha
State President of the Republic of South Africa :: Staatspresident van die Republiek van Suid-Afrika
14 Sep 1984 - 15 Aug 1989 Pieter Willem Botha 
Acting State President of the Republic of South Africa :: Waarnemende Staatspresident van die Republiek van Suid-Afrika
15 Aug 1989 - 20 Sep 1989 Frederik Willem de Klerk
State President of the Republic of South Africa :: Staatspresident van die Republiek van Suid-Afrika
20 Sep 1989 - 10 May 1994 Frederik Willem de Klerk  [3]

[1] Instead of Theophilus Ebenhaezer Dönges who was elected State President of the Republic of South Africa :: Staatspresident van die Republiek van Suid-Afrika on 28 Feb 1967, but did not take office.
[2] Continues in the office of Acting State President of the Republic of South Africa :: Waarnemende Staatspresident van die Republiek van Suid-Afrika from 14 Aug 1978.
[3] From 27 Apr 1994 pending the election and installation of a President under Art. 235 of the Interim Constitution (Act 200 of 1993), effective from that date.