Hirzstein, Mountain summit in Habichtswald Nature Park, Germany

Hirzstein is a mountain summit in Habichtswald in northern Hesse, rising 502 meters above sea level. The peak sits within dense forests and features a viewing platform equipped with telescope poles for exploring the distant landscape.

In the 18th century, basalt tuff was quarried near the summit for the construction of the Hercules monument in Kassel; this quarrying exposed the natural basalt dike known as the Teufelsmauer. The Hirzstein has been a protected area since 1979, when a 0.27 km² nature reserve covering the summit and the Teufelsmauer was established. Ring walls near the summit are listed as a cultural monument.

At the Hirzstein viewpoint, 474.8 m up, stands a "Hirzstein-Fernrohre-Guckpfahl": a post holding 22 tubes, each aimed at a sight target such as a hill or village, with the target's name and distance engraved on the tube. Targets include the Langenberge, Großenritte, Elgershausen and Hoof with its Burgberg, and the Knüllgebirge beyond the Odenberg. The Kassel-Steig long-distance trail passes over the mountain and the Teufelsmauer.

Multiple hiking trails lead to the summit, with parking facilities available near the mountain base accessible via the A44 motorway. The routes are well-marked and suit visitors of varying fitness levels.

The nearby Devil's Wall, located about 450 meters northeast of the summit, was exposed through basalt quarrying in the 18th century and reveals the region's mining heritage. This rock formation stands as a reminder of the area's industrial past.