Møkster is an island in Austevoll municipality in Vestland county, Norway. The 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. The island had 65 inhabitants in 2001.