|Administrative region||South Aegean|
|• Municipal unit||23.7 km2 (9.2 sq mi)|
|• Municipal unit||3,006|
|• Municipal unit density||130/km2 (330/sq mi)|
|Time zone||EET (UTC+2)|
|• Summer (DST)||EEST (UTC+3)|
Poseidonia (Greek: Ποσειδωνία, named after Poseidon) is a village and a former municipality on the island of Syros, in the Cyclades, Greece. Since the 2011 local government reform it is part of the municipality Syros-Ermoupoli, of which it is a municipal unit. The population was 3,006 inhabitants at the 2001 census, and the land area is 23.705 km². The municipal unit shares the island of Syros with the municipal units of Ano Syros and Ermoupoli. Also known as Dellagrazia (name taken from a small church Maria Della Grazia).
- De Facto Population of Greece Population and Housing Census of March 18th, 2001 (PDF 39 MB). National Statistical Service of Greece. 2003.
- Kallikratis law Greece Ministry of Interior (Greek)
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