Posidonia (disambiguation)

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