Poseidonia is a village and a former municipality on the island of Syros, Cyclades, Greece.

Look up Poseidonia, Ποσειδωνία, or Ποσειδωνία in Wiktionary, the free dictionary.

Poseidonia may also refer to:

• Poseidonia, Isthmus of Corinth, Greece, a harbour on the western end of the Corinth Canal
• Poseidonia (Magna Graecia), a ruined Ancient Greek and Roman city in southern Italy
• Basaidu, a village in Hormozgan, Iran
• Poseidonia, a mythical name for Athens from the Ancient Greek myth The Gift of Athena, the myth of the founding of Athens

• An Ancient Greek festival celebrating the sea god Poseidon
• The realm of the Ancient Greek sea god Poseidon
• Posidonia, a sea grass genus, also called Poseidonia
• Thambemyia poseidonia, species of fly, also called Conchopus poseidonius
• Innisfallen (ship) (1948), a ship named Poseidonia from 1967 to 1985
• MV Ulster Queen (1967), a ship named Poseidonia from 1988 to 2005

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• Posidonia (disambiguation)
• Poseidon (disambiguation)

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