Giske is an island municipality in Møre og Romsdal county, Norway. The municipality lies north-northwest of the town of Ålesund in the traditional district of Sunnmøre. The municipal center is Valderhaugstrand. Other population centers include the villages of Roald (on Vigra island) and Alnes and Leitebakk (both on Godøy island). The municipality is part of the Ålesund Region.