Trundholm municipality was a municipality (Danish, kommune) in West Zealand County on the northwest coast of the island of Zealand (Sjælland) in Denmark, in a region or landscape known as Odsherred.
The municipality covered an area of 163 km², and had a total population of 11,309 (2005).
Because the former municipality of Trundholm is located near the end of a peninsula and because it features a long spit of land, Zealand's Point (Sjællands Odde), at its northwest which stretches out into the Kattegat, it is surrounded by much water.
Ferry service via Mols-linien connects the former municipality at the town of Sjællands Odde northwest over the Kattegat to the Danish mainland, the Jutland peninsula, at Århus and Ebeltoft.
This created a municipality with an area of 355 km² and a total population of 32,739 (2005).