The Roman Catholic Diocese of Kroonstad (Latin: Kroonstaden(sis)) is a diocese located in the city of Kroonstad in the ecclesiastical province of Bloemfontein in South Africa. The last ordinary was Bishop Peter Holiday whose resignation for health reasons was accepted on 12 December 2022.

• 26 November 1923: Established as Apostolic Prefecture of Kroonstad from the Apostolic Vicariate of Kimberley in South Africa
• 8 April 1935: Promoted as Apostolic Vicariate of Kroonstad
• 11 January 1951: Promoted as Diocese of Kroonstad

• Prefects Apostolic of Kroonstad (Roman rite)
  • Fr. Guglielmo Herting, C.S.Sp. (1923 – 1924)
  • Fr. Léon Klerlein, C.S.Sp. (1924.03.24 – 1935.04.08 see below)
• Vicars Apostolic of Kroonstad (Roman rite)
  • Bishop Léon Klerlein, C.S.Sp. (see above 1935.04.08 – 1948.02.12), appointed Vicar Apostolic of Bethlehem
  • Bishop Gerard Marie Franciskus van Velsen, O.P. (1950.05.31 – 1951.01.11 see below)
• Bishops of Kroonstad (Roman rite)
  • Bishop Gerard Marie Franciskus van Velsen, O.P. (see above 1951.01.11 – 1975.11.15)
  • Bishop Johannes Ludgerus Bonaventure Brenninkmeijer, O.P. (1977.04.15 – 2003.07.02)
  • Bishop Stephen Brislin (2006.10.17 – 2009.12.18), appointed Archbishop of Cape Town
  • Bishop Peter Holiday (2011.04.01 - 2022.12.12)

• Roman Catholicism in South Africa

• GCatholic.org
• Catholic Hierarchy

27°39′00″S 27°14′00″E / 27.6500°S 27.2333°E / -27.6500; 27.2333