Burg Naumburg, Medieval castle in Naumburg, Germany.

Burg Naumburg is a ruined hilltop castle on a 338 m cone southwest above Naumburg's old town in the Kassel district. Only small remnants of walls and ditches survive. A 1646 Merian engraving, based on a 1605 drawing by Wilhelm Dilich, shows a double three-storey palas with a steep tent roof, a rectangular bergfried, corner oriels and a stair turret.

The Nuwenburc was probably built at the start of the 12th century by the Edelfreien von Naumburg and is first documented in 1182. In 1265 Count Volkwin died; his brother Widekind, a canon in Halberstadt, sold the ancestral lands to Landgrave Henry I of Hesse, though Mainz acquired half of castle and town in 1266. A feud over these sales led to the castle's destruction in 1271/1273; it was rebuilt and later held by the von Hertingshausen family for nearly 150 years.

The name Nuwenburc, meaning "new castle", implies an older fortification stood here before the counts of Naumburg built their seat. The settlement below, first recorded in 1206 and granted town rights in 1260, grew under the castle's protection. Today an information board of the Eco Pfad Archäologie Naumburg explains the former layout to visitors.

The castle site lies on a hill southwest above Naumburg's old town, reachable on foot from the town or by car to a nearby parking area. Only small remnants of walls and ditches remain, and an information board of the Eco Pfad Archäologie Naumburg explains the castle's former appearance.

The castle's appearance before the 17th century is unknown; the only visual record is a copper engraving by Matthäus Merian from 1646, based on a 1605 drawing by Wilhelm Dilich. It shows a double three-storey palas with a steep tent roof, a rectangular bergfried, corner oriels and a stair turret. Today only small remnants of walls and ditches survive on the hilltop.