Rineia or Rhenea (Ρήνεια) is a Greek island in the Cyclades. It lies just west of the island of Delos and further southwest of the island of Mykonos, of which it and Delos are administratively a part. Its area is 14 km². It had a small population until the 1980s, but is currently uninhabited. In ancient times the island was subdued by the tyrant Polycrates ofSamos and dedicated to the Delian Apollo.