- Catholic Archdiocese of Naxos – Tinos – Andros- Myconos, Religious Legal Person
Seat in Tinos
(central and northern Aegean sea. The islands of Naxos, Paros, Antiparos, Koufonisia, Donousa, Sxoinousa, Amorgos, Tinos, Mykonos, Andros and Delos)
- Catholic Archdiocese of Corfu Zante and Cefalonia, Religious Legal Person
Seat in Corfu
(northern Greece, The islands of Corfu, Paxoi, Antipaxoi, Lefkada, Ithaki, Kephallonia, Zakinthos and region of Epirus )
- Catholic Archdiocese of Athens, Religious Legal Person
Seat in Athens
(Counties of central Greece and Evia and Skyros, Peloponnisos, the islands of Argosaronikos, Kithera and Antikithera)
- Catholic Archdiocese of Rodos, Religious Legal Person
Seat in Rodos – Apostolic Administrator : Catholic Archbishop of Athens
(Dodecanese)
- Catholic Diocese of Syros, Religious Legal Person
seat in Syros
The islands of Cyclades. Syros, Gyaros, Kea, Kithnos, Serifos, Sifnos Milos and Kimolos,
- Catholic Diocese of Thira (Santorini), Religious Legal Person
Seat in Thira
The islands of Thira, Therrasia, Ios, Anafi, Folegandros and Sikinos
- Catholic Diocese of Crete, Religious Legal Person
Seat in Chania, Crete – Apostolic Administrator : Catholic Bishop of Syros
- Catholic Diocese of Chios (Lesbos-Samos), Religious Legal Person
Seat in Chios – Apostolic Administrator : Catholic Archbishop of Naxos -Tinos
The islands of Chios, Psara, Oinousses, Lesvos, Lemnos, Samos, Ikaria, Fourni
- Apostolic Vicariate of Thessalonica, Religious Legal Person
Seat in Thessalonica – Apostolic Administrator : Catholic Archbishop of Corfu
Macedonia, Thraki, Thessalia, the islands of northern Sporades (except Skyros), Thasos, Samothraki
- Exarch of Byzantine Rite, Religious Legal Person
Seat in Athens
- Ordinariat of Armenian Rite, Religious Legal Person
Seat in Athens
