Burgruine Hohenburg, Medieval castle ruin in Hohenfels, Germany.

Burgruine Hohenburg is a ruined hilltop castle on the rocky, partly bare summit of the 520.9 m Schloßberg, above the Lauterach valley near Hohenburg. Its surviving walls, visible from the valley, belong to a square keep with a round interior, an east-adjacent hall with inner and outer limestone ashlar facing and two latrine bays, and a zwinger.

The fortress was built in medieval times to protect trade routes and maintain control over the region. Over the centuries, the structure underwent several rebuildings and modifications to its defensive systems.

The name Hohenburg comes from the Diepoldinger family of margraves, first mentioned in 1050, who built the castle before 1000. The Bavarian knight Livin von Wirsberg, sentenced to life imprisonment for heresy, died in the castle in 1468. The ruin is recorded as a Bavarian monument under file number D-3-73-134-38.

The ruin lies inside the US Army Hohenfels Training Area, so it cannot be visited. It stands on the rocky, partly bare summit of the 520.9 m Schloßberg, just above the village of Hohenburg in the Lauterach valley. Mauerreste are visible from the valley, but access to the site itself is closed.

Excavations have revealed multiple construction phases showing how fortress architecture and defensive technology evolved over centuries. These layers reveal how medieval builders adapted their structures to changing military threats and strategies.