The Roman Catholic Church in Tanzania is composed of 7 ecclesiastical provinces and 28 suffragan dioceses.
List of dioceses Episcopal Conference of Tanzania Ecclesiastical Province of Arusha Archdiocese of Arusha Diocese of Mbulu Diocese of Moshi Diocese of Same
Ecclesiastical Province of Dar-es-Salaam Archdiocese of Dar-es-Salaam Diocese of Bagamoyo Diocese of Morogoro Diocese of Tanga Diocese of Zanzibar Diocese of Ifakara Diocese of Mahenge
Ecclesiastical Province of Dodoma Archdiocese of Dodoma Diocese of Kondoa Diocese of Singida
Ecclesiastical Province of Mbeya Archdiocese of Mbeya Diocese of Iringa Diocese of Sumbawanga Diocese of Mafinga
Ecclesiastical Province of Mwanza Archdiocese of Mwanza Diocese of Bukoba Diocese of Bunda Diocese of Geita Diocese of Kayanga Diocese of Musoma Diocese of Rulenge-Ngara Diocese of Shinyanga Diocese of Bariadi
Ecclesiastical Province of Songea Archdiocese of Songea Diocese of Lindi Diocese of Mbinga Diocese of Mtwara Diocese of Njombe Diocese of Tunduru-Masasi
Ecclesiastical Province of Tabora Archdiocese of Tabora Diocese of Kahama Diocese of Kigoma Diocese of Mpanda
External links Catholic-Hierarchy entry. GCatholic.org.