Agdenes is a municipality in Sør-Trøndelag county, Norway. It is part of the Orkdalen region. The administrative centre is the village of Selbekken. Other villages in the municipality include Ingdalen, Lensvik, Vassbygda, and Leksa.

The municipality of Værnes was established on 1 January 1896 when it was separated from the large municipality of Ørland. It encompassed the area along the Trondheimsleia and initially, the population was 1,412. The name was changed to Agdenes on 17 May 1897 by a royal resolution.

On 1 January 1964, the western part of Agdenes (Ytre Agdenes) was merged into Snillfjord along with Heim. On the same date, the municipality of Lensvik (population: 1,136) and the Ingdalen area of Stadsbygd (population: 171) were merged into Agdenes to form a larger municipality of Agdenes.

On 1 January 1995, the Moldtun area (population: 21) was transferred to neighboring Snillfjord. This was because the area had been without an outside road connection, and once the road was built, it was built in the direction of Snillfjord, not Agdenes. Therefore, it was logical for the residents to vote to change municipalities.

The municipality (originally the parish) is named after the old Agdenes farm (Old Norse: Agðanes), since the first church was built there. The meaning of the first element is unknown (but it is probably the same as in the name Agder) and the last element is nes which means "headland".

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