Poseidonia (disambiguation)

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

Poseidonia may also refer to:

Places

 * 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

Other uses

 * 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, a ship named Poseidonia from 1988 to 2005