Burgruine Rodenberg, Medieval castle ruin in Rotenburg an der Fulda, Germany

Burgruine Rodenberg is a medieval fortress situated on a forested hilltop near Rotenburg an der Fulda. The remains include stonework, a polygonal keep foundation, and substantial ramparts that cover a considerable area of the hillside.

The fortress was built after 1122 by the Ludowinger dynasty as a strategic military stronghold. It was destroyed in 1372 during regional conflict, leaving the ruins that remain today.

The town's name is probably derived from the castle, and the surrounding slope is still called Hausberg, as Matthias Merian the Elder recorded. The castle was held as a Hessian fief by ministerialis families such as von Trott, von Baumbach and von Berlepsch, who served there as Burgmannen.

The ruin is freely accessible. From the last public car park of the Herz-Kreislauf-Zentrum (HKZ), a well-signposted path leads northwest uphill. After the climb, past the White Cross of the expellees' memorial, a little-used path branches right; it splits, with the right branch very steep directly to the ruin and the left branch a drivable path to the western main entrance.

The name of the town Rotenburg an der Fulda is probably derived from the castle. The hill itself was called Hausberg or Haußberg by Matthias Merian the Elder, and Hausberg is still the field name today.