Tunø is a Danish island in the Kattegat, approximately 4 km west of the neighbouring island of Samsø. The island covers an area of 3.52 km² and has 113 inhabitants, as of 2005. It comes under the administration of Odder municipality. Tunø By is the only village on the island, with the hamlet of Løkkegårde as the second most populated area.Tunø harbour, lies a little east of the town of Tunø By, and is protected by 2 piers. It has room for approximately 170 boats.