The 1980 South African Open was a men's tennis tournament played on outdoor hard courts in Johannesburg, South Africa that was part of the 1980 Volvo Grand Prix. It was the 77th edition of the tournament and was held from 25 November through 1 December 1980. Seventh-seeded Kim Warwick won the singles title.
Kim Warwick defeated 
Fritz Buehning 6–2, 6–1, 6–2
Bob Lutz / Stan Smith defeated Heinz Günthardt / 
Paul McNamee 6–7, 6–3, 6–4