Møkster is an island in Austevoll municipality in Hordaland county, Norway. The 1.4-square-kilometre (350-acre) island lies in an archipelago and it sits north of the islands of Litla Kalsøya, Stolmen, and Selbjørn; west of the islands of Drøna and Rostøya; and south of the islands of Horga, Stora Kalsøy and Hundvåko.