Regional units of Greece
The 74 regional units are administrative units of Greece. They are subdivisions of the country's 13 regions, and are further subdivided into municipalities. They were introduced as part of the Kallikratis administrative reform on 1 January 2011 and are comparable in area and, in the mainland, coterminous with the 'pre-Kallikratis' prefectures of Greece.
| Administrative Region | Regional unit | Prefecture it was created from |
| Attica | North Athens | Athens |
| Attica | West Athens | Athens |
| Attica | Central Athens | Athens |
| Attica | South Athens | Athens |
| Attica | East Attica | East Attica |
| Attica | Piraeus | Piraeus |
| Attica | Islands | Piraeus |
| Attica | West Attica | West Attica |
| Central Greece | Boeotia | Boeotia |
| Central Greece | Euboea | Euboea |
| Central Greece | Evrytania | Evrytania |
| Central Greece | Phocis | Phocis |
| Central Greece | Phthiotis | Phthiotis |
| Central Macedonia | Imathia | Imathia |
| Central Macedonia | Thessaloniki | Thessaloniki |
| Central Macedonia | Kilkis | Kilkis |
| Central Macedonia | Pella | Pella |
| Central Macedonia | Pieria | Pieria |
| Central Macedonia | Serres | Serres |
| Central Macedonia | Chalkidiki | Chalkidiki |
| Crete | Chania | Chania |
| Crete | Heraklion | Heraklion |
| Crete | Lasithi | Lasithi |
| Crete | Rethymno | Rethymno |
| East Macedonia and Thrace | Drama | Drama |
| East Macedonia and Thrace | Evros | Evros |
| East Macedonia and Thrace | Thasos | Kavala |
| East Macedonia and Thrace | Kavala | Kavala |
| East Macedonia and Thrace | Xanthi | Xanthi |
| East Macedonia and Thrace | Rhodope | Rhodope |
| Epirus | Arta | Arta |
| Epirus | Ioannina | Ioannina |
| Epirus | Preveza | Preveza |
| Epirus | Thesprotia | Thesprotia |
| Ionian Islands | Corfu | Corfu |
| Ionian Islands | Ithaca | Cephalonia |
| Ionian Islands | Cephalonia | Cephalonia |
| Ionian Islands | Lefkada | Lefkada |
| Ionian Islands | Zakynthos | Zakynthos |
| North Aegean | Chios | Chios |
| North Aegean | Ikaria | Samos |
| North Aegean | Lemnos | Lesbos |
| North Aegean | Lesbos | Lesbos |
| North Aegean | Samos | Samos |
| Peloponnese | Arcadia | Arcadia |
| Peloponnese | Argolis | Argolis |
| Peloponnese | Corinthia | Corinthia |
| Peloponnese | Laconia | Laconia |
| Peloponnese | Messenia | Messenia |
| South Aegean | Andros | Cyclades |
| South Aegean | Kalymnos | Dodecanese |
| South Aegean | Karpathos | Dodecanese |
| South Aegean | Kea-Kythnos | Cyclades |
| South Aegean | Kos | Dodecanese |
| South Aegean | Milos | Cyclades |
| South Aegean | Mykonos | Cyclades |
| South Aegean | Naxos | Cyclades |
| South Aegean | Paros | Cyclades |
| South Aegean | Rhodes | Dodecanese |
| South Aegean | Syros | Cyclades |
| South Aegean | Santorini | Cyclades |
| South Aegean | Tinos | Cyclades |
| Thessaly | Karditsa | Karditsa |
| Thessaly | Larissa | Larissa |
| Thessaly | Magnesia | Magnesia |
| Thessaly | Sporades | Magnesia |
| Thessaly | Trikala | Trikala |
| West Greece | Achaea | Achaea |
| West Greece | Aetolia-Acarnania | Aetolia-Acarnania |
| West Greece | Elis | Elis |
| West Macedonia | Florina | Florina |
| West Macedonia | Grevena | Grevena |
| West Macedonia | Kastoria | Kastoria |
| West Macedonia | Kozani | Kozani |