Thymaina (Greek: Θύμαινα) is a small Greek island in the Ikaria regional unit, in the eastern Aegean Sea. Thymaina is located just west of Fournoi Korseon and is administratively a part of its municipality. Its name is said to be derived from the thyme that grows throughout the island. Thymaina has two settlements, Thymaina settlement and Keramidou. The population of the island is 191 inhabitants according to the 2021 census, 179 in Thymaina settlement and 12 in Kerameidou. The area is 10 square kilometres (4 sq mi). Thymaina is a protected area along with all Fournoi cluster and belongs to the network Natura 2000.