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The Roman Catholic Diocese of Sumbawanga (Latin: Dioecesis Sumbavangensis) is a diocese located in Sumbawanga in the ecclesiastical province of Mbeya in Tanzania.

• 1880: Established as the Apostolic Vicariate of Tanganyika from the Apostolic Vicariate of Central Africa in Sudan
• May 10, 1946: Renamed as Apostolic Vicariate of Karema
• March 25, 1953: Promoted as Diocese of Karema
• October 24, 1969: Renamed as Diocese of Sumbawanga
• December 21, 2018: Changed metropolia from Tabora to Mbeya

• Vicars Apostolic of Tanganyika (Roman rite) -- see also separate article Apostolic Vicariate of Tanganyika
  • Bishop Jean-Baptiste-Frézal Charbonnier, M. Afr. (1887.01.14 - 1888.03.1616)
  • Bishop Léonce Bridoux, M. Afr. (1888.06.15 Jun 1888 - 1890.10.20)
  • Bishop Adolphe Le Chaptois, M. Afr. (1891.06.19 - 1917.11.30)
  • Bishop Joseph-Marie Birraux, M. Afr. (1920.04.22 - 1936.04.22), appointed Superior General of Missionaries of Africa (White Fathers)
  • Bishop Jan Cornelius van Sambeek, M. Afr. (1936.11.19 - 1947.05.10), appointed Vicar Apostolic of Kigoma
• Vicar Apostolic of Karema (Roman rite)
  • Bishop James Holmes-Siedle, M. Afr. (1946.07.29 – 1953.03.25 see below)
• Bishops of Karema (Roman rite)
  • Bishop James Holmes-Siedle, M. Afr. (see above 1953.03.25 – 1958.08.05), appointed Bishop of Kigoma
  • Bishop Charles Msakila (1958.11.13 – 1969.10.24 see below)
• Bishops of Sumbawanga (Roman rite)
  • Bishop Charles Msakila (see above 1969.10.24 – 1994.02.23)
  • Bishop Damian Kyaruzi (1997.04.21 - 2018.04.19)
  • Bishop Beatus Christian Urassa (since 2018.04.19)

• Roman Catholicism in Tanzania

• GCatholic.org
• Catholic Hierarchy

7°58′00″S 31°37′00″E / 7.966667°S 31.616667°E / -7.966667; 31.616667