Oberbauenstock, Mountain summit in Uri and Nidwalden, Switzerland

Oberbauenstock is a mountain peak in Uri and Nidwalden, Switzerland, rising to 2,117 meters and overlooking Lake Lucerne from its slopes. The summit commands views across the surrounding alpine terrain and the lake valley below.

The peak formed during the Alpine mountain-building period millions of years ago when tectonic forces reshaped the landscape. This geological process created the mountain chain visible today across central Switzerland.

Locals also call the peak Baberg. In 1983 the Nagra named it a possible site for a radioactive waste repository; around 150 people founded the citizens' initiative "Atommüll Hiä Niä" in opposition, and a 1984 study by the Ökos office raised doubts about safety. The Nagra dropped the site after 1993.

The summit is accessible through several hiking routes of varying difficulty, with most climbs considered moderately demanding. The Niederbauen cable car can be used to gain initial elevation and reduce the hiking time required.

In 1983 the Nagra named the Oberbauenstock, alongside the Niderbauen Chulm, as a possible site for a radioactive waste repository, citing its marl layers and the geological data from the Seelisberg Tunnel. Local opposition formed the citizens' initiative "Atommüll Hiä Niä" on 5 March 1983, and the Nagra dropped the site after 1993.