The Gonzen is a high mountain of the Appenzell Alps, overlooking the Rhine Valley above Sargans, in the canton of St. Gallen, Switzerland. It lies at the southeastern end of the Alvier chain ( or '), located southeast of the Churfirsten, together with the (from west to east): Gamsberg, Fulfirst, Alvier and Gauschla, among others.
The summit of the Gonzen can be reached via a trail on the northern side.