Ulstein is a municipality in Møre og Romsdal county, Norway. It is part of the Sunnmøre region. The commercial and administrative centre of Ulstein is the town of Ulsteinvik, with a population of 6,033 people (2013). The municipality occupies the western half of the island of Hareidlandet, as well as about 30 or more smaller islands, four of which are populated. The municipality has a population of 8,208 people.