Burgruine Neufürstenberg, Schwarzwald-Baar, Medieval castle ruins in Vöhrenbach, Germany

Burg Neu-Fürstenberg is the ruin of a spur castle on a rocky spur 810 m above sea level above the mouth of the Urach stream into the Breg, in the Hammereisenbach-Bregenbach district of Vöhrenbach. The small complex formed an irregular quadrangle without a keep, protected on the west by a shield wall still 15 m high and 4.7 m thick at its base. An artificial neck ditch cut the castle site off from the mountain; substantial foundations of the core castle and remains of a presumed outer bailey survive.

The castle was probably built around 1360 by the Counts of Fürstenberg on a 12th-century predecessor, securing the road between Baar and Breisgau and, from the 16th century, controlling ore mining in the Eisenbachtal. First mentioned in 1381, it was pawned to Margrave Bernhard I of Baden in 1405. The death in 1411 of pledge-holder Hans von Hornberg, who held a lifelong right of residence, triggered the Lupfener Fehde. Count Heinrich VI called it a "worthless house" in 1485; on 8 May 1525 the Klettgauer Haufen under Hans Müller destroyed it in the German Peasants' War.

The castle's name, Neu-Fürstenberg, distinguishes it from the older Fürstenberg castle nearby. Its 1411 pledge to Margrave Bernhard I of Baden ended with the death of the pledge-holder Hans von Hornberg, who held a lifelong right of residence there; this death triggered the Lupfener Fehde between the Fürstenbergers and the Counts of Lupfen. Today only the shield wall and foundations remain for visitors to see.

The ruins are accessible through a short walk from the Breg bridge, and entry is completely free. The location between two waterways makes it easy to orient yourself while exploring the site.

The castle was described as a "worthless house" by Count Heinrich VI of Fürstenberg in 1485, decades before its destruction. The artificial neck ditch that separated the site from the mountain can still be traced in the terrain.