Odder Municipality is a municipality in the Central Denmark Region on the east coast of the Jutland peninsula in Central Denmark south of Aarhus. It is a part of the greater Aarhus area. The municipality covers an area of 225.04 km², including the islands of Alrø and Tunø. It borders Aarhus Municipality to the north, Skanderborg Municipality to the north-west and Horsens Municipality to the west. It also connects to Hedensted Municipality across Horsens Fjord to the south, and connects to Samsø Municipality through a ferry route.

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 square kilometres, has a circumference of 9.5 km (5.9 mi) and has total of 66 inhabitants as of November 2022. 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.