Neuenburg Castle (German: Schloss Neuenburg) is a hilltop castle in the south of the German state of Saxony-Anhalt, on the spur-like foothills of a plateau above the eastern bank of the river Unstrut.

Below the castle to the north lies the wine-growing town of Freyburg, which in turn is about seven kilometers north of Naumburg (Saale).

The castle is a stop on the Romanesque Road, a route through the state of significant cultural and historic sites.The castle is owned and managed by the Saxony-Anhalt Cultural Foundation.

[1] The castle was built around 1090 by the Thuringian count Ludwig der Springer, securing his territory in the east, as did its sister castle Wartburg in the west.

[2] The name Neuenburg derives from German for "new castle".