Tustna is a former municipality in Møre og Romsdal county, Norway. The administrative centre was the village of Gullstein. The municipality is located in the present-day Aure Municipality. The municipality included the main islands of Tustna, Stabblandet, and Solskjelsøya, as well as many smaller, surrounding islets between the Edøyfjorden and the Vinjefjorden. In 2006, when the municipality was merged into Aure, it was 141 square kilometres (54 sq mi).