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The following lists events that happened during 1905 in South Africa.
Incumbents
- Governor of the Cape of Good Hope and High Commissioner for Southern Africa:Walter Hely-Hutchinson.
- Governor of the Colony of Natal: Henry Edward McCallum.
- Prime Minister of the Cape of Good Hope: Leander Starr Jameson.
- Prime Minister of the Orange River Colony: Alfred Milner (until 7 June), William Palmer, 2nd Earl of Selborne (starting 7 June).
- Prime Minister of the Colony of Natal: George Morris Sutton (until 16 May), Charles John Smythe (starting 16 May).
Events
;January
- 26 – The Cullinan Diamond, the largest diamond in the world at , is discovered by Captain Frederick Wells at Cullinan.
;Unknown date
- Non-whites are not given voting rights, except in the Cape Colony.
- The Cape Town City Hall in Darling Street is built.
Births
- 3 February – Herman Charles Bosman, writer and journalist, is born at Kuilsrivier, Cape Town. (d. 1951)
- 8 April – Helen Joseph, activist, is born in Sussex, England. (d. 1992)
- 5 July – Jock Cameron, cricketer. (d. 1935)
- 9 August – Moses Kotane, anti-apartheid activist. (d. 1978)
- 2 September – Harry Hart, athlete. (d. 1979)
- 4 September – Eileen Mary Challans, writer is born in Essex, England. (d. 1983)
Deaths
- 18 April – Enoch Sontonga, composer of Nkosi Sikelel' iAfrika, dies at age 32.
Railways
Railway lines opened
- 1 February – Free State – Springfontein to Jagersfontein, .
- 1 March – Free State – Aberfeldy to Bethlehem, .
- 18 May – Cape Eastern – Xalanga to Elliot, .
;Natal
- The Natal Government Railways places two Class A 4-6-2| Pacific locomotives in service, designed by Locomotive Superintendent D.A. Hendrie for passenger traffic on the mainline between Ladysmith and Charlestown. In 1912 they will be designated Class 2 on the South African Railways (SAR).
;Transvaal
- The Central South African Railways places two four-cylinder rack tank steam locomotives in service on the section between Waterval Onder and Waterval Boven, but they are underpowered and prove to be failures in rack service.
