Torsken is a municipality on the western coast of Senja island in Troms county, Norway. The administrative centre of the municipality is the village of Gryllefjord. The church of Torsken dates back to the 18th century. Ånderdalen National Park is located in Torsken and neighboring Tranøy.
The municipality of Torsken was established on 1 January 1902 when it was separated from the municipality of Berg. The initial population of Torsken was 1,229. On 1 January 1964, the Rødsand area of Torsken (population: 160) was transferred to the neighboring municipality of Tranøy.