Alimia or Alimnia (Αλιμνιά) is a Greek island of the Aegean Sea, located in the sea area between Rhodes and Halki, in the complex of the Dodecanese. The surface of the island is 7.4 square kilometres and it has a coastline of 21 kilometres. The island had a small population until the period of the Second World War, and in recent decades has remained uninhabited.