Austafjord is a small village in the municipality of Vikna in Nord-Trøndelag county, Norway. It is located on the island of Ytter-Vikna, approximately west of Rørvik. Austafjord sits about half way between the nearby villages of Garstad and Valøya. Austafjord has a population of about 30, as well as a shop, a school, and a day-care center. Austafjord is the western terminus of Norwegian County Road 770.