The following is the List of the Roman Catholic dioceses of Japan. The Roman Catholic Church in Japan is comprised of sixteen ecclesiastical territories called dioceses led by prelate bishops. Dioceses led by archbishops are called archdioceses. There are three archdioceses which serve as the seats of three metropolitan provinces of the Roman Catholic Church.
Province of Nagasaki
- Archdiocese of Nagasaki
- Diocese of Fukuoka
- Diocese of Kagoshima
- Diocese of Naha
- Diocese of Oita
Province of Osaka
- Archdiocese of Osaka
- Diocese of Hiroshima
- Diocese of Kyoto
- Diocese of Nagoya
- Diocese of Takamatsu
Province of Tokyo
- Archdiocese of Tokyo
- Diocese of Niigata
- Diocese of Sapporo
- Diocese of Sendai
- Diocese of Urawa
- Diocese of Yokohama
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