Agerø is a small Danish island in Limfjorden located in the waters between the larger island of Mors, to which it is connected by a dam and a bridge, and the Thyholm Peninsula. With an area of 3.8 km2, it has a population of 38 as of 1 January 2010. Most of the island is cultivated but in the north there is a 25 hectare nature reserve of coastal meadows which are an important rest stop for migratory birds.