The Roman Catholic Church in Tanzania is composed of 7 ecclesiastical provinces and 28 suffragan dioceses.List of diocesesEpiscopal Conference of TanzaniaEcclesiastical Province of ArushaArchdiocese of ArushaEcclesiastical Province of Dar-es-SalaamArchdiocese of Dar-es-SalaamEcclesiastical Province of DodomaArchdiocese of DodomaEcclesiastical Province of MbeyaEcclesiastical Province of MwanzaArchdiocese of MwanzaEcclesiastical Province of SongeaArchdiocese of SongeaEcclesiastical Province of TaboraArchdiocese of Tabora