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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.

Episcopal Conference of Australia

Exempt

Exempt archdioceses are immediately subject to the Holy See:

Archdiocese of Canberra and Goulburn, covering the federal district Canberra and adjacent part of New South Wales
Archdiocese of Hobart, covering Tasmania
Military Ordinariate of Australia, for the armed forces
Personal Ordinariate of Our Lady of the Southern Cross, with see in Maylands, Western Australia (for former Anglicans in Australia and Japan)

Ecclesiastical Province of Adelaide

The ecclesiastical Province of Adelaide covers the whole of the state of South Australia, and the territory of the Northern Territory

Metropolitan Archdiocese of Adelaide, in South Australia
- Diocese of Darwin, covering the Northern Territory
- Diocese of Point Pirie, in South Australia

Ecclesiastical Province of Brisbane

The ecclesiastical Province of Brisbane covers the whole of the state of Queensland

Metropolitan Archdiocese of Brisbane

Ecclesiastical Province of Melbourne

The province covers the whole of the state of Victoria

Metropolitan Archdiocese of Melbourne
- Diocese of Ballarat
- Diocese of Sale
- Diocese of Sandhurst
- Ukrainian Catholic Diocese of Saints Peter and Paul of Melbourne (Ukrainian Catholic Church Byzantine Rite Eparchy (Diocese), with cathedral see in North Melbourne, Victoria, Australia; also covers New Zealand and Oceania

Ecclesiastical Province of Perth

The ecclesiastical Province of Perth covers all of Western Australia

Metropolitan Archdiocese of Perth, also covers Christmas Island, Cocos Islands, Heard Island and McDonald Islands

Ecclesiastical Province of Sydney

The province covers most of the state of New South Wales

Metropolitan Archdiocese of Sydney, also covers Norfolk Island

Eastern Catholic dioceses

Maronite Diocese of Saint Maron of Sydney, with cathedral see in Redfern, New South Wales; immediately subject to the Maronite Patriarch of Antioch (in Lebanon; Antiochian Rite)
Melkite Greek Catholic Eparchy of Saint Michael Archangel in Sydney, with cathedral see in Darlington, New South Wales; also covers New Zealand; immediately subject to the Melkite Catholic Patriarchate of Antioch in Syria (a Byzantine Rite)
Syro-Malabar Diocese of Saint Thomas the Apostle of Melbourne, with cathedral see in Melbourne, Victoria; immediately subject to the Major Archbishop of Ernakulam–Angamaly in India (a Syro-Oriental Rite)
Chaldean Catholic Eparchy of Saint Thomas the Apostle of Sydney, with cathedral see at Bossley Park, New South Wales; also covers New Zealand; immediately subject to the Chaldean Catholic Patriarch of Babylon in Iraq (Chaldean Rite).

Episcopal Conference of New Zealand

See under § Episcopal Conference of Australia for the Chaldean Catholic, Melkite and Ukrainian Catholic dioceses competent for both countries, with sees in Sydney, Melbourne.
See also the infra-Episcopal Conference of the Pacific §§ Ecclesiastical Province of Samoa-Apia, Ecclesiastical Province of Suva, and Immediately Subject to the Holy See for three island dependencies of New Zealand, being: the diocese of Rarotonga (on the Cook Islands, also covering Niue) and the Mission Sui Iuris of Tokelau, both suffragans of the Metropolitan Archbishop of Suva
Exempt, i.e., immediately subject to the Holy See:
- Military Ordinariate of New Zealand, for the armed forces

Ecclesiastical Province of Wellington

Metropolitan Archdiocese of Wellington

Episcopal Conference of the Pacific

For Ukrainian Catholics, see § Episcopal Conference of Australia, under Melbourne
The "United States Minor Outlying Islands" (U.S. Minor Islands), such as Wake, Midway, Johnston, which are Unincorporated Territories of USA, are administered by the Archdiocese for the Military Services of the United States in Washington, D.C.
Honolulu (on and for Hawaii) is a suffragan diocese in the ecclesiastical Province of San Francisco in California, U.S.