Midøya (sometimes called Mia) is an island in Molde Municipality in Møre og Romsdal county, Norway.

Until 1965, the island was divided between the municipalities of Sør-Aukra and Vatne.

The name is identical with the word miðja which means "in the middle".

The island lies between the two other islands of Dryna and Otrøya - but it could also refer to the fact that the island was an important border mark between the district of Sunnmøre (and the Gulating assembly) and the district of Romsdal (and the Frostating assembly).

This article about an island in Møre og Romsdal is a stub.