Luster is a municipality in the county of Sogn og Fjordane, Norway. It is located in the traditional district of Sogn. The administrative centre is Gaupne. Other villages include Skjolden, Hafslo, Jostedal, and Veitastrond.
Luster centers around the inner branch of the Sognefjord, which is called the Lustrafjord. Luster is one of the largest municipalities by area in all of southern Norway. Its landscape includes fjords, steep mountains, water-abundant waterfalls, blue glaciers, and valleys. Both Jostedalsbreen National Park and Breheimen National Park are partially located in this municipality.