|Administrative region||South Aegean|
|• Municipal unit||23.7 km2 (9.2 sq mi)|
|• Municipal unit||3,893|
|• Municipal unit density||160/km2 (430/sq mi)|
|• Population||928 (2011)|
|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 3,893 inhabitants at the 2011 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).
- "Απογραφή Πληθυσμού - Κατοικιών 2011. ΜΟΝΙΜΟΣ Πληθυσμός" (in Greek). Hellenic Statistical Authority.
- Kallikratis law Greece Ministry of Interior (Greek)
- "Population & housing census 2001 (incl. area and average elevation)" (PDF) (in Greek). National Statistical Service of Greece.
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