The regions of Greece (Greek: περιφέρειες, romanized: periféreies) are the country's thirteen second-level administrative entities, counting decentralized administrations of Greece as first-level. Regions are divided into regional units, known as prefectures until 2011.

Quick Facts Regions of Greece Περιφέρειες της Ελλάδας (Greek), Category ...

Regions of Greece Περιφέρειες της Ελλάδας (Greek)
Category	Unitary state
Location	Hellenic Republic
Number	13 Regions 1 Autonomous Region
Populations	197,810 (North Aegean) – 3,812,330 (Attica)
Areas	2,307 km2 (891 sq mi) (Ionian Islands) – 18,810 km2 (7,260 sq mi) (Central Macedonia)
Government	Central government Regional governments monastic government (Athos)
Subdivisions	Regional units

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The current regions were established in July 1986 (the presidential decree officially establishing them was signed in 1987), by decision of the interior minister, Menios Koutsogiorgas, as second-level administrative entities, complementing the prefectures (Law 1622/1986).^[1] Before 1986, there was a traditional division into broad historical–geographical regions (γεωγραφικά διαμερίσματα), which, however, was often arbitrary; not all of the pre-1986 traditional historical-geographic regions had official administrative bodies. Although the post-1986 regions were mostly based on the earlier divisions, they are usually smaller and, in a few cases, do not overlap with the traditional definitions: for instance, the region of Western Greece, which had no previous analogue, comprises territory belonging to the Peloponnese peninsula and the traditional region of Central Greece.

As part of a decentralization process inspired by Interior Minister Alekos Papadopoulos, they were accorded more powers in the 1997 Kapodistrias reform of local and regional government. They were transformed into fully separate entities by the 2010 Kallikratis Plan (Law 3852/2010), which entered into effect on 1 January 2011. In the 2011 changes, the government-appointed general secretary (γενικός γραμματέας) was replaced with a popularly elected regional governor (περιφερειάρχης) and a regional council (περιφερειακό συμβούλιο) with five-year terms. Many powers of the prefectures, which were also abolished or reformed into regional units, were transferred to the region level. The regional organs of the central government were in turn replaced by seven decentralized administrations, which group from one to three regions under a government-appointed general secretary.

Bordering the region of Central Macedonia there is one autonomous region, Mount Athos (Agion Oros, or "Holy Mountain"), an autonomous monastic community under Greek sovereignty. It is located on the easternmost of the three large peninsulas jutting into the Aegean from the Chalkidiki peninsula.

Wikimedia Commons has media related to Regions of Greece.

• Administrative divisions of Greece
• ISO 3166-2:GR
• List of Greek regions by Human Development Index