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The following lists events that happened during 1921 in South Africa.

Incumbents

  • Monarch: King George V
  • Governor-General and High Commissioner for Southern Africa: Prince Arthur of Connaught
  • Prime Minister: Jan Smuts
  • Chief Justice: James Rose Innes

Events

;May

  • 3 &ndash; The second census of the Union of South Africa takes place.
  • 24 &ndash; The Bulhoek Massacre takes place with an estimated 163 killed.

;July

  • 30 &ndash; The Communist Party of South Africa is established.

;December

  • 28 &ndash; White gold miners on the Witwatersrand go on strike in the Rand Rebellion.

;Unknown date

  • Dagbreek men's residence opens at Stellenbosch University.

Births

  • 30 May &ndash; Jamie Uys, actor and film director. (d. 1996)
  • 21 July &ndash; Vusamazulu Credo Mutwa, Zulu sangoma and author (d. 2020)

Deaths

  • 10 September &ndash; John Tengo Jabavu, editor of South Africa's first newspaper in Xhosa. (b. 1859)

Railways

Railway lines opened

thumb|[[South African Class GA 2-6-0+0-6-2|Class GA]]

thumb|[[South African Class GB 2-6-2+2-6-2|Class GB]]

  • 1 November &ndash; Transvaal &ndash; Pretoria West to Roberts Heights, .
  • 28 November &ndash; Natal &ndash; Booth Junction to Cato Ridge, .
  • June &ndash; The first of seven Class GB 2-6-2+2-6-2 Garratt locomotives.