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Torsken is a former municipality that was located on the western coast of the large island of Senja in the old Troms county, Norway. The municipality existed from 1902 until its dissolution in 2020 when it was merged into the new Senja Municipality. The administrative centre of the municipality was the village of Gryllefjord. Other larger villages in Torsken municipality included the villages of Torsken, Medby, and Flakstadvåg.
The historic Torsken Church in the village of Torsken dates back to the 18th century. Ånderdalen National Park was partially located inside the old borders of Torsken and neighboring Tranøy municipalities.
At the time of its dissolution as a municipality on 1 January 2020, the 243-square-kilometre (94 sq mi) municipality was the 310th largest by area out of the 422 municipalities in Norway. Torsken was also the 401st most populous municipality in Norway with a population of 943. The municipality's population density was 4 inhabitants per square kilometre (10/sq mi) and its population has decreased by 0.6% over the previous decade.