Jøa[1] is an island in Namsos Municipality in Trøndelag county, Norway.

The 55.3-square-kilometre (21.4 sq mi) island lies on the south side of the Foldafjord, between the mainland and the islands of Otterøya and Elvalandet.

The 297-metre (974 ft) tall Moldvikfjellet is the highest point on the island.

[2] The Norwegian writer Olav Duun was born in the village of Dun, in the central part of the island, where Dun Church is located.

[2] Also, Fosnes Chapel is located on the northeastern coast of the island, at the site of the old church and graveyard.