Lontzen (German pronunciation: [ˈlɔntsn̩]) is a municipality located in East Belgium.

The total area is 28.73 km2 which gives a population density of 198 inhabitants per km2.

The municipality consists of the following sub-municipalities: Lontzen proper, Herbesthal, and Walhorn.

In the 19th century, a Low Franconian dialect was widely spoken in Lontzen.

This Liège Province location article is a stub.