The following lists events that happened during 1920 in South Africa.
- 1 – The South African Air Force (SAAF) is established, the second autonomous Air Force in the world after the Royal Air Force (RAF).
- 12 February – Raymond Mhlaba, anti-apartheid activist and politician. (d. 2005)
- 20 February – Zoe Gail, singer and actress. (d. 2020)
- 9 March – Robert Resha, journalist and political dissident. (d. 1974)
- 20 March – Lionel Bernstein, anti-apartheid activist and political prisoner (d. 2002)
- 8 April – Vuyisile Mini, anti-apartheid activist and politician. (d. 1964)
- 12 May – Gerald Stapleton, Battle of Britain fighter pilot. (d. 2010)
- 11 June – David Millin, movie director, producer, and cinematographer. (d. 1999)
- 11 July – Edison Ntsanwisi, politician and Chief Minister of Gazankulu. (d. 1993)
- 30 July – Harry Gwala, anti-apartheid activist and politician. (d. 1995)
- 8 August – Nimrod Sejake, labour leader and activist. (d. 2004)
- 11 September – Hymie Barsel, political activist. (d. 1987)
- 12 September – Michiel Daniel Overbeek, amateur astronomer and prolific variable star observers. (d. 2001)
- 24 December – Richard Maponya, entrepreneur and property developer. (d. 2020)
- Archontology.org: A Guide for Study of Historical Offices: South Africa: Governors-General: 1910-1961 (Accessed on 14 April 2017)
- Nöthling, Kol C.J., Martins, Maj du P. (1990). Kroniek van die Suid-Afrikaanse Lugmag (1920-1990), (1st ed.). Direktoraat Openbare Betrekkinge, SAW. Uitgewer: Staatsdrukkery, Pretoria. Gedruk deur Promedia Drukkers, Posbus 255, Silverton, 0127.
- Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 54–56. ISBN 0869772112.
- Holland, D. F. (1972). Steam Locomotives of the South African Railways. Vol. 2: 1910-1955 (1st ed.). Newton Abbott, England: David & Charles. pp. 38–41. ISBN 978-0-7153-5427-8.