Burgstall Löweneck, Medieval castle ruins in Nittendorf, Germany.

Burgstall Löweneck is a castle ruin situated on a rocky ridge of Kühberg mountain, located above the Naab Valley. The stone remains stand at approximately 430 meters elevation and command views across the surrounding landscape.

The castle was probably built by the Wittelsbachs shortly before 1277, when Hugo von Löweneck first appears in a document. In 1316 King Ludwig the Bavarian ordered that the castle, already destroyed, should not be rebuilt. Dietrich von Parsberg then sold the site with the village of Penk to Pielenhofen Abbey for 345 pounds of Regensburg pfennigs.

The site reveals how medieval nobles built fortifications on hilltops to monitor trade routes and river crossings in the region. Visitors can observe the layout and understand the defensive logic that shaped how people controlled movement through the valley below.

The site is accessible via a hiking trail starting from Penk village, which is part of the Regensburg Castle Trail network. Visitors should wear sturdy footwear since the path is steep in places and the hilltop is exposed to weather.

In the 1820s, gendarmes surprised treasure diggers at the site; a farmer's boy who tried to flee was shot dead, while the others escaped down the rocks. The robber diggings damaged the castle mound, and only the ditch and a short stretch of wall survive today.