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 centre is Valderhaugstrand. Other population centres include the villages of Roald (on Vigra island) and Alnes and Leitebakk (both on Godøy island). The municipality is part of the Ålesund Region.
The 41 km2 municipality is the 413th largest by area out of the 422 municipalities in Norway. Giske is the 132nd most populous municipality in Norway with a population of 8,176. The municipality's population density is 205.1 PD/km2 and its population has increased by 23% over the last decade.
Giske Municipality was established on 1 January 1908 when it was separated from the large municipality of Borgund. The initial population of the new municipality was 1,708 and it included the islands of Valderøya, Godøya, and Giske. Then on 1 January 1964, the neighbouring Vigra Municipality (on the island of Vigra was merged into Giske Municipality. The newly enlarged municipality had a population of 4,644.