Tustna is an island in Aure Municipality in Møre og Romsdal county, Norway. The 87.5-square-kilometre (33.8 sq mi) island lies in the western part of the municipality. The island of Tustna lies west of the islands of Stabblandet and Solskjelsøya; to the northeast of the islands of Frei and Nordlandet; and south of the island of Smøla. The Edøyfjorden runs along the northern shores of the island, the Vinjefjorden (and Halsafjorden) are to the south, the Freifjorden is to the southwest, the Talgsjøen is to the west, and the open Norwegian Sea is to the northwest.