Prasonisi, also known as Vryonisi, is an uninhabited Greek islet, in the Aegean Sea, close to the northern coast of eastern Crete. It is extremely small, measuring just 0.034 square kilometres (370,000 sq ft) in area. Notably, there is a shipwreck on the islet's southern side, over thirty metres beneath the sea; the ship itself is broken up and possibly buried but remains of pottery, including amphorae, have been reported. Various species of sea snail have been recorded living on and around the island. The island itself is mostly covered by salt-tolerant plants.

• List of islands of Greece