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
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Exempt archdioceses are immediately subject to the Holy See:
Ecclesiastical Province of Adelaide
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The ecclesiastical Province of Adelaide covers the whole of the state of South Australia, and the territory of the Northern Territory
Ecclesiastical Province of Brisbane
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The ecclesiastical Province of Brisbane covers the whole of the state of Queensland
Ecclesiastical Province of Melbourne
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The province covers the whole of the state of Victoria
Ecclesiastical Province of Perth
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The ecclesiastical Province of Perth covers all of Western Australia
Ecclesiastical Province of Sydney
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The province covers most of the state of New South Wales
Eastern Catholic dioceses
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Episcopal Conference of New Zealand
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- 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:
Ecclesiastical Province of Wellington
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Episcopal Conference of the Pacific
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- Exempt, i.e., immediately subject to the Holy See
Ecclesiastical Province of Agaña
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Ecclesiastical Province of Nouméa
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Ecclesiastical Province of Papeete
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Ecclesiastical Province of Samoa-Apia
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Ecclesiastical Province of Suva
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Episcopal Conference of Papua New Guinea
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Ecclesiastical Province of Madang
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Ecclesiastical Province of Mount Hagen
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Ecclesiastical Province of Port Moresby
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Ecclesiastical Province of Rabaul
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Episcopal Conference of the Solomon Islands
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Ecclesiastical Province of Honaira
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