Torsken (Northern Sami: Doaskku suohkan) is a former municipality that was located on the western coast of the large island of Senja in 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.

Prior to its dissolution in 2020, the 243-square-kilometre (94 sq mi) municipality was the 310th largest by area out of the 422 municipalities in Norway. Torsken Municipality was also the 403rd most populous municipality in Norway with a population of 931. The municipality's population density was 3.8 inhabitants per square kilometre (9.8/sq mi) and its population has increased by 1.6% over the previous decade.

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 both Torsken Municipality and neighboring Tranøy Municipality.

Torsken Municipality was established on 1 January 1902 when it was separated from Berg. The initial population of Torsken was 1,229. During the 1960s, there were many municipal mergers across Norway due to the work of the Schei Committee. On 1 January 1964, the Rødsand area of Torsken (population: 160) was transferred to the neighboring Tranøy Municipality.

In March 2017, the Parliament of Norway voted to merge Berg Municipality, Torsken Municipality, Lenvik Municipality, and Tranøy Municipality. The new municipality would encompass the whole island of Senja plus part of the mainland located between the Gisundet strait and the Malangen fjord. On 1 January 2020, Torsken Municipality ceased to exist when it became part of the new Senja Municipality.

The municipality (originally the parish) is named after the old Torsken farm (Old Norse: Þoskar) since the first Torsken Church was built there. The farm (and municipal) name were taken from the nearby mountain, Torsken. The name comes from the word þorskr which means "cod". (Several mountains in Norway are named after their likeness with a fish.)

The coat of arms was granted on 23 March 1990. The official blazon is "Sable, a cross moline Or" (Norwegian: I svart et gull ankerkors). This means the arms have a black field (background) and the charge is a cross moline (Norwegian: ankerkors; lit. 'anchor cross'). The cross moline has a tincture of Or which means it is commonly colored yellow, but if it is made out of metal, then gold is used. The cross is a symbol for both Christianity and the importance of the local harbor. The economy of Torsken is largely dependent on its harbors and an anchor cross is an appropriate symbol. The arms were designed by Ivar Enoksen.

The Church of Norway had one parish (sokn) within Torsken Municipality. It was part of the Senja prosti (deanery) in the Diocese of Nord-Hålogaland.