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