Burg Nidberg, Medieval fortress in Marienberg, Germany.

Burg Nidberg is a medieval fortress standing above the Schwarze Pockau river near Marienberg, featuring preserved tower foundations and defensive structures from the 12th century. The ruins occupy a mountain spur and reveal the strategic location that once controlled an important river crossing.

The fortress was founded around 1150 and served as the seat of a local noble family. It controlled a historic path that allowed travelers to safely cross the Schwarze Pockau river.

The name Nidberg, recorded around 1150 as "Nidperc", is tied to the ministerial family von Neidberg, whose member Werner is named as the castle's builder. The site formed a castle-settlement complex with the now-deserted village of Schwedengraben across the Schwarze Pockau, directing settlers along the old Bohemian Steig. Finds from the 12th to 14th centuries, including a presumed tower foundation, are protected as a Bodendenkmal.

The ruins lie about one kilometer northwest of Zöblitz and are reachable via marked hiking trails. The site is easy to explore on foot and offers views over the surrounding highlands.

The Neidberg family controlled the fortress for several generations until the 14th century. This local ruling dynasty shaped the region's development and left marks still visible today in local place names.