Gemsstock is a mountain of the Swiss Lepontine Alps , overlooking Andermatt in the Canton of Uri . A glacier named Gurschenfirn lies over its northern flanks. The Gemsstock is a subpeak of the higher Chastelhorn , lying approximately one kilometre south-west.

Gemsstock is part of the Gotthard Oberalp Arena, as is Naetschen, which sits on the other side of Andermatt.

There are two 'skiing sections' on Gemsstock. There is a cable car in Andermatt which goes directly up to the middle of the mountain.