Breitenstein, Mountain summit in Bavaria, Germany.

Breitenstein is a mountain summit in the Bavarian Prealps near Fischbachau, with two distinct peaks reaching around 1,622 meters. The massif rises steeply above the surrounding valley and is clearly visible from a long distance.

The Breitenstein is the northwesternmost summit of the Wendelstein group, named in the Alpine Club guide to the Bavarian Prealps East (1992). Its two peaks, the 1,622 m main summit and the 1,575 m Bockstein, are climbed on marked paths from Birkenstein via the Kesselalm and Hubertushütte, routes described in that guide and on the Alpine Club map BY 16.

The Hubertushütte at 1,535 m is open only in the summer half-year, and the Kesselalm below it also stays open in winter when the weather is good. The forest road from the Kesselalm is then used as a sled run, so tobogganers share the normal route with hikers. The name Bockstein belongs to the 1,575 m western secondary summit, which carries its own summit cross.

The ascent typically starts from Fischbachau and can be done via several routes with different levels of effort required. Good physical condition is advised, especially for the direct route to the top.

The natural rock arch Breitensteiner Fensterl on the west side is listed by the Bavarian Environment Agency as a geotope (no. 182R005) and as a natural monument. The two-peaked mountain also has a small lake between its main summit and the Bockstein.