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).^[4]

Tustna was originally a part of the municipality of Edøy (see formannskapsdistrikt law). A meeting held on 17 March 1863 decided to build a church on the island of Tustern (which was the name of the island at that time) and thereby gain status as a separate parish within the large municipality. Gullstein Church was built in the village of Gullstein on the eastern side of the island in 1864. A royal resolution of 3 May 1873 directed that the parish of Tustern be separated from Edøy Municipality to create a separate municipality effective on 1 January 1874. The new municipality, called Tustna, had an initial population of 1,179.^[5]

During the 1960s, there were many municipal mergers across Norway due to the work of the Schei Committee. On 1 January 1965, the part of Tustna on the island of Ertvågsøy (population: 85) was transferred to neighboring Aure Municipality to the east. On 1 January 2006, all of Tustna Municipality was merged into Aure Municipality. At its end, Tustna had a population of 1,006.^[6][7][5]

While it existed, this municipality was responsible for primary education (through 10th grade), outpatient health services, senior citizen services, unemployment, social services, zoning, economic development, and municipal roads. During its existence, this municipality was governed by a municipal council of directly elected representatives. The mayor was indirectly elected by a vote of the municipal council.^[13]

• List of former municipalities of Norway