Gemsstock is a mountain of the Swiss Lepontine Alps, overlooking Andermatt in the canton of Uri.

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.

In the future, Orascom Hotels and Development plan to build 5 new ski lifts, along with several new runs, as part of their Andermatt expansion project.

[3] This idea would have been very costly to construct, maintain, and run, and may have been unpopular with the residents of Andermatt, due to the fact that it would block the view of the sky above.