This is a list of the Roman and Eastern Catholic dioceses in Oceania.
Because Oceania is one of the more sparsely populated areas of the world, the majority of its dioceses are located in Australia and New Zealand, although they range as far as the Midway Atoll in the Pacific Ocean to Tasmania.
Exempt archdioceses are immediately subject to the Holy See:
The ecclesiastical Province of Adelaide covers the whole of the state of South Australia, and the territory of the Northern Territory
The ecclesiastical Province of Brisbane covers the whole of the state of Queensland
The province covers the whole of the state of Victoria
The ecclesiastical Province of Perth covers all of Western Australia
The province covers most of the state of New South Wales
An exarch was the holder of any of various historical offices, some of them being political or military and others being ecclesiastical.
The Eparchy of Saints Peter and Paul of Melbourne is a Ukrainian Greek Catholic Church ecclesiastical territory or eparchy of the Catholic Church in Australia. Headquartered in Melbourne, it is a suffragan in the ecclesiastical province of the metropolitan Archbishop of Melbourne, a Latin Church territory.
The Catholic Church in Syria is part of the worldwide Catholic Church, under the spiritual leadership of the Pope in Rome.
In the canon law of the Catholic Church, a mission sui iuris, also known as an independent mission, can be defined as: "an ecclesial structure erected from a previous territory, with explicit boundaries, under the care of a religious community or other diocese, responding to a missionary exigency and headed by a superior nominated by the Holy See, under the aegis of the Congregation for the Evangelization of Peoples."
The Chaldean Catholic Archeparchy of Urmiā is a Metropolitan archeparchy of the Chaldean Catholic Church with seeing in Urmia, West Azerbaijan Province, north-west Iran.
An ecclesiastical region is a formally organised geographical group of dioceses, ecclesiastical provinces or parishes, without a proper Ordinary as such, in Catholic or Protestant Churches.
The Ordinariate for Eastern (Rite) Catholics in France is a Catholic Ordinariate for Eastern Catholic faithful, jointly for Eastern Catholics in various rites and languages of particular churches sui iuris without proper jurisdiction there.
