Burg Naumburg, Medieval castle ruins in Bärenbach, Germany.

Burg Naumburg is a ruined hilltop castle near Bärenbach in the Bad Kreuznach district, on a rise above the Naheland by the B41 between Idar-Oberstein and Kirn. Only some foundation walls of the former complex remain visible today.

The fortress was founded in 1146 and passed through several hands over the centuries. It was destroyed by French forces in 1803 and gradually fell into ruin afterward.

The name Naumburg means "new castle", a foundation set up alongside the older Kyrburg above Kirn or the Hachenfels stronghold. From 1381 the castle was only an administrative seat: the Amt Naumburg, attached to the front county of Sponheim, covered the courts of Becherbach, Bärenbach and Martin-Weierbach plus shares in Oberreidenbach and Löllbach. In 1776 the seat of the office was moved to Herrstein.

Access to the ruins is free and open to visitors at any time. The paths can be muddy or steep depending on the weather, so sturdy footwear is recommended.

The name Naumburg means "new castle", marking it as a new foundation beside the older Kyrburg above Kirn or the Hachenfels fortress. In 1323 Raugraf Konrad V. of the Stolzenberg line handed the "Veste Nuenburg bei Kyr" to Archbishop Balduin of Trier as a fief for 600 pounds of heller. Only a few foundation walls remain today.