Brunnistock, Alpine summit in Uri, Switzerland.

Brunnistock is a 2,952-metre summit in the Urner Alps of the Swiss canton of Uri, the highest point of the range north of the Surenen Pass and the highest point of both Attinghausen and Isenthal. Its west flank holds the Blüemlisalpfirn glacier, the Gitschenhöreli (2,906 m) stands just to its north-east as a pre-summit, and the ground falls south over several hundred metres of steep rock walls to the pass.

The Brunnistock lies on the boundary between Attinghausen and Isenthal, and is the highest point of both municipalities. Together with the Blackenstock it forms the head of the Isental valley. The normal ascent is a high alpine tour (grade L) from the Isental over the Blüemlisalpfirn glacier.

The Brunnistock marks the highest point of both Attinghausen and Isenthal, and together with the Blackenstock it closes off the Isental valley head. The usual ascent is a high-alpine route (grade L) from the Isental over the Blüemlisalpfirn glacier, so the mountain is approached as glacier terrain rather than by marked valley paths.

The summit is best reached from Riedmatt near St. Jakob im Isenthal, where marked trails branch toward both the northern and southern approaches. The route demands stamina and experience on rocky alpine terrain.

The Gitschenhöreli (2,906 m), just northeast of the summit, is regarded as the Brunnistock's pre-summit. The mountain is the highest point of both Attinghausen and Isenthal, and together with the Blackenstock it closes off the Isental valley head.