Mosterøy is a former municipality in Rogaland county, Norway. The administrative centre was the village of Askje where the Askje Church is located. The municipality existed from 1884 until 1965. The island municipality included the islands of Mosterøy, Klosterøy, Fjøløy, Sokn, Bru, and the western half of Åmøy. Today, Mosterøy is part of the municipality of Rennesøy.

Mosterøy is a former municipality in Rogaland county, Norway. The administrative centre was the village of Askje where the Askje Church is located. The municipality existed from 1884 until 1965. The island municipality included the islands of Mosterøy, Klosterøy, Fjøløy, Sokn, Bru, and the western half of Åmøy. Today, Mosterøy is part of the municipality of Rennesøy.