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The following lists events that happened during 1890 in South Africa.
Incumbents
- Governor of the Cape of Good Hope and High Commissioner for Southern Africa:Henry Brougham Loch.
- Governor of the Colony of Natal: Charles Bullen Hugh Mitchell.
- State President of the Orange Free State: Francis William Reitz.
- State President of the South African Republic: Paul Kruger.
- Prime Minister of the Cape of Good Hope: John Gordon Sprigg (until 16 July), Cecil John Rhodes (starting 16 July).
Events
;March
- 17 – The first railway line in the Transvaal, known as the Randtram, is opened for service between Boksburg and Braamfontein in Johannesburg.
;July
- 17 – Cecil Rhodes becomes Prime Minister of the Cape Colony.
Births
- 26 October – Percy Hansen, Danish soldier in British service, recipient of the Victoria Cross. (d. 1951)
Railways
Railway lines opened
- 1 February – Cape Western – Somerset West to Sir Lowry's Pass Village, .
- 28 March – Natal – Glencoe Junction to Talana, .
- 15 May – Natal – Glencoe Junction to Newcastle, .
- The first of four Clara Class 0-6-2 tender locomotives are placed in service by the Cape Copper Company on its narrow gauge Namaqualand Railway between Port Nolloth and O'okiep.
;Transvaal
- The Nederlandsche-Zuid-Afrikaansche Spoorwegmaatschappij (NZASM) of the Zuid-Afrikaansche Republiek (Transvaal Republic) places six 18 Tonner saddle-tank locomotives in service on construction work on the Delagoa Bay line.
