The Church, place by place
Find a Catholic Diocese
Meet the diocese behind your parish. Explore its bishop, cathedral, history and churches, then find a place for Mass.
3,158 published diocesan profiles
- Diocese of Oita 大分Oita 大分 · Japan
- Diocese of OkigweOkigwe · Nigeria
- Archdiocese of Olinda e RecifeOlinda e Recife · Brazil
- Diocese of OliveiraOliveira · Brazil
- Diocese of OndjivaOndjiva · Angola
- Diocese of OndoOndo · Nigeria
- Diocese of OotacamundOotacamund · India
- Diocese of OpoleOpole · Poland
- Diocese of Oppido Mamertina–PalmiOppido Mamertina–Palmi · Italy
- Diocese of Oradea MareOradea Mare · Romania
- Diocese of Oradea Mare, Gran Varadino, NagyváradOradea Mare · Romania
- Diocese of OranOran · Algeria
- Diocese of Orange in CaliforniaOrange · United States
- Diocese of OrenseOrense · Spain
- Diocese of OriaOria · Italy
- Diocese of Orihuela-AlicanteOrihuela-Alicante · Spain
- Archdiocese of OristanoOristano · Italy
- Diocese of OrizabaOrizaba · Mexico
- Diocese of OrlandoOrlando · United States
- Diocese of OrluOrlu · Nigeria
- Diocese of OrléansOrléans · France
- Diocese of OruroOruro · Bolivia
- Diocese of Orvieto–TodiOrvieto–Todi · Italy
- Diocese of OránOrán · Argentina
- Archdiocese of Osaka–Takamatsu 大阪高松Osaka–Takamatsu 大阪高松 · Japan
- Diocese of OsascoOsasco · Brazil
- Diocese of OsloOslo · Norway
- Diocese of Osma-SoriaOsma-Soria · Spain
- Diocese of OsnabrückOsnabrück · Germany
- Diocese of OsogboOsogbo · Nigeria
An independent guide compiled from published sources. Coverage varies by diocese.