The Bristen (3,073 m) is a mountain in the Glarus Alps, overlooking the valley of the Reuss and located to the south of Amsteg in the canton of Uri, Switzerland.

The mountain is located about four kilometres north of Piz Giuv and the border with Graubünden.

Located below the northern arête on 2'095 m is the Bristensee - two hectare wide and 6,5 meters deep.

The southern part of the mountain consists of several different types of rocks, among them rhyolite and amphibolite.

For amateur geology the region around the Bristen is interesting, as it is famous for its many different types of minerals and quartz.