Burgruine Zengenberg an der Hainleite, Medieval castle ruins in Wernrode, Germany.

Burgruine Zengenberg an der Hainleite is an abandoned hilltop castle on a spur of the Zengenberg at 416 m above sea level, west of Wernrode. Its triangular 45-by-18-metre plateau is cut off on the west by a crescent-shaped rampart two metres high and eight metres wide, fronted by a nine-metre-wide ditch. No masonry survives; only red-brown brick fragments have been found.

The castle was built in the 11th century by the von Zenge family, a Thuringian noble house, to secure Wernrode and Wolkramshausen and to control the trade route over the Hainleite between Mühlhausen and Nordhausen. It was completely destroyed during the Thirty Years' War (1618–1648).

The name Zengenberg comes from the von Zenge(n) family, a Thuringian noble house that built the castle in the 11th century. The fortification guarded the villages of Wernrode and Wolkramshausen and controlled the trade route over the Hainleite between Mühlhausen and Nordhausen. No masonry survives; only a crescent-shaped rampart and ditch mark the site.

Marked hiking trails lead visitors to the ruin and connect it with other historical fortifications in the area. The best viewpoints are reached on foot, and the paths are generally well-marked.

No masonry survives at the site; only a crescent-shaped rampart two metres high and eight metres wide with a nine-metre-wide ditch in front of it marks the western approach. Werner Schroeter found red-brown brick fragments there, which point to former brickwork rather than stone walls.