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.

Ulstein is connected to the mainland of Norway by the Eiksund Bridge (to the island of Eika) and then the Eiksund Tunnel to Ørsta Municipality. The Grasøyane Lighthouse is located on a small island in the northwestern part of Ulstein Municipality.

The municipality of Ulstein (originally Ulfsteen) was established as a municipality on 1 January 1838 (see formannskapsdistrikt). It originally included most of the island of Hareidlandet (except the Eiksund area) and the Vartdal area southeast of the Vartdalsfjorden on the mainland. On 1 January 1895, the area southeast of the Vartdalsfjorden was separated from Ulstein Municipality to become the new municipality of Vartdalsstranden. This left Ulstein with 2,996 residents. Then on 1 January 1917, the eastern half of the island of Hareidlandet was separated from Ulstein to form the new Hareid Municipality. This left 2,336 residents in Ulstein. On 1 January 1964, the island of Eika, the village of Eiksund, and the surrounding area (population: 222) were transferred from Herøy Municipality to Ulstein Municipality.

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