Vikna Municipality

Vikna is a former municipality in Trøndelagcounty, Norway. The island municipality existed from 1869 until its dissolution in 2020. It is now part of Nærøysund Municipality in the Namdalenregion. The administrative centre of the municipality was the village of Rørvik. Other villages in Vikna included Austafjord, Garstad, and Valøya.

At the time of its dissolution in 2020, the 319-square-kilometre (123 sq mi) municipality was the 269th largest by area out of the 422 municipalities in Norway. Vikna Municipality was the 216th most populous municipality in Norway with a population of 4,578. The municipality's population density was 14.4 inhabitants per square kilometre (37/sq mi) and its population had increased by 11.4% over the last decade.