Burgruine Malsburg, Medieval castle ruin in Hohenborn, Germany.

Burgruine Malsburg is a castle ruin near Zierenberg that consists of preserved wall sections and a tower. The tower measures approximately 6.5 meters (21 feet) in diameter, and the remaining walls reveal the rectangular layout of the original main structure.

The castle was first documented in 1123 and gained importance during the Thuringian-Hessian War of Succession in the 13th century. This conflict shaped regional history and underscored the fortress's strategic role in medieval power struggles.

The name "von der Malsburg" was adopted by ministerials Stephen and Dietrich, documented in 1143, who were probably a branch of the Schartenberg family and took their name from the castle. In 1337 the Malsburg lords opened the castle to the Archbishop of Mainz and enfeoffed their village Esebecke to him, receiving it back as a hereditary castle fief.

The ruins sit on a forested basalt hilltop in the northern section of Habichtswald Nature Park. Reaching the site requires a short walk through woodland terrain, and the setting offers good views of the surrounding landscape from above.

The ruin keeps a tower stump 6.5 m across with a spiral stair core, plus the shaft of the castle well. Around it stand three other former castles within about 4 km: Schartenberg to the southeast, Falkenberg to the south-southeast and Escheberg Palace to the south-southwest.