Losser (Dutch pronunciation: [ˈlɔsər] ⓘ) is a municipality and a town in the eastern Netherlands.

Both were almost completely destroyed when on 21 September 1665, troops from Münster set fire to them.

[6] One of the town's oldest buildings is the Martinustoren (St. Martin's Tower), dating from around 1500 and the only remaining part of a church demolished in 1903.

A few kilometers west of De Lutte, close to the border with Oldenzaal, lies the Tankenberg, a hill the top of which (85 m) is the highest point in the province.

The municipality's most important body of water is the river Dinkel.