The Glärnisch is a mountain massif of the Schwyz Alps, overlooking the valley of the Linth in the Swiss canton of Glarus.

It consists of several summits, of which the highest, Bächistock, is 2,915 metres above sea level.

The massif of the Glärnisch consists of two ridges of either side of the glacier named Glärnischfirn, culminating at the Ruchen to the west, rising more than 2,000 metres above the Klöntalersee, and at the Bächistock to the southwest.

The surrounding peaks are generally accessible to hikers and climbers only by traversing the length of the glacier itself.

In recent years, the glacier has lost a massive amount of its volume and its tongue has retreated sharply.