Tranøy is a municipality in Troms county, Norway. The municipality is situated on the southern coast of the large island of Senja. The administrative centre is the village of Vangsvik in the eastern part of the municipality. Other important villages include Stonglandseidet, Skrollsvika, and Å.

The now abandoned island of Tranøya, with the 18th-century wooden Tranøy Church, used to be the centre of activities for the municipality. From Tranøybotn it is only a short walk to the Ånderdalen National Park, with varied landscapes within a very limited area, including deep pine forests.

The large municipality of Tranøy was established on 1 January 1838 (see formannskapsdistrikt). The original municipality included all the land surrounding the large Solbergfjorden. On 1 September 1886, the municipality was divided into three separate municipalities: Tranøy, Dyrøy, and Sørreisa. After this, Tranøy had 1,239 inhabitants.

On 1 January 1964 several changes took place. The mainland areas of Tranøy (population: 382) were transferred to Dyrøy and the Hellemo, Paulsrud, Johnsgård, and Stormo farms (population: 106) were transferred to Lenvik. At the same time, the parts of Bjarkøy on Senja and Lemmingsvær islands (population: 480) and the Rødsand area of Torsken (population: 160) were both transferred to Tranøy.

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