Posidonia is a genus of seagrasses.

"Posidonia" may also refer to:

Posidonia (band), an Italian band, formed in Turin Paestum, a Greek city in Italy, sometimes called "Posidonia" or "Poseidonia" Poseidonia or Posidonia, a village on the island of Syros (Greece) Posidonia Shale, a geological formation from the Lower Jurassic Posidonia an extinct genus of ostreoidean bivalve from the Paleozoic and Mesozoic Posidònia (satellite), a Spanish Earth observation satellite

See also

Poseidonia (disambiguation) Poseidon (disambiguation) Posidon