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The following lists events that happened during 1918 in South Africa.
Incumbents
- Monarch: King George V.
- Governor-General and High Commissioner for Southern Africa: The Viscount Buxton.
- Prime Minister: Louis Botha.
- Chief Justice: James Rose Innes
Events
- An estimated 50 people die in the 1918 flu pandemic in South Africa, the fifth hardest hit country in the world.
;January
- 8 – The Koöperatiewe Wijnbouwers Vereniging van Zuid-Afrika (KWV) is founded in Paarl.
;April
- 2 – Victoria College becomes the Stellenbosch University.
;May
- 14 – The Three Minute Pause, initiated by the daily firing of the Noon Gun on Signal Hill, is instituted by Cape Town Mayor Sir Harry Hands.
;June
- 4 – RMS Kenilworth Castle, one of the Union-Castle Line steamships, collides with her escort destroyer HMS Rival while trying to avoid her other escort, the cruiser HMS Kent.
- 5 – The Afrikaner Broederbond, a confidential cultural organisation, is founded in Johannesburg.
;November
- 14 – German East African troops are informed of the armistice on 11 November.
- 25 – General Paul von Lettow-Vorbeck, commander of German forces in the German East Africa campaign, signs a ceasefire at Abercorn in Northern Rhodesia.
Births
- 14 January (in Mozambique) – Dimitri Tsafendas, assassin (d. 1999)
- 21 January – Frederick Guy Butler, poet, academic and writer. (d. 2001)
- 1 July – Ahmed Deedat, Sunni Muslim missionary. (d. 2005)
- 13 July – Larry Taylor, actor. (d. 2003)
- 16 July – John (Jack) Frost, Second World War fighter pilot. (d. MIA 1942)
- 18 July – Nelson Mandela, activist and President of South Africa. (d. 2013)
- 27 August – Alina Lekgetha, nurse, chairman of South African Nursing Association and politician. (d. 1992)
Deaths
- 5 December – Schalk Willem Burger, Boer officer, lawyer, politician and statesman. (b. 1852)
Railways
Railway lines opened
thumb|[[South African Class 15B 4-8-2|Class 15B]]
thumb|[[South African Class MJ1 2-6-6-0|Class MJ1]]
- 2 February – Cape – Kootjieskolk to Calvinia, .
- 16 September – Cape – Kootjieskolk to Sakrivier, .
- The first of thirty Class 15B 4-8-2 Mountain type locomotives.
