Schloss Ehrenberg, Medieval spur castle in Altenburg, Germany.

Schloss Ehrenberg is a spur castle in Altenburg, Germany, positioned on a strategic hilltop and displaying neo-renaissance and neo-baroque design from its 1878-1880 reconstruction. The castle now serves a practical purpose, with its restored outbuildings housing the offices of a regional newspaper.

The castle was first documented in 1244 and passed through multiple owners after the local burgrave family died out in 1329. Between 1805 and 1816 the premises functioned as a cotton spinning mill, until a major fire destroyed the agricultural structures.

The name Ehrenberg traces to Sifridus de Herinberc, recorded in 1244. A 16th-century round tower survives from earlier building phases and was absorbed into the 1878–1880 historicist rebuild. The park laid out around 1880, with garden house, fountain and grotto, remains legible as a park, and a street name in the village still recalls the pheasantry built in 1828.

The castle is privately owned and being restored; the sources do not confirm public access to the grounds or interiors. The outbuildings house the Kurier, the weekly paper for the Altenburg, Schmölln and Meuselwitz area. The site lies on a hill spur near Ehrenberg, just outside Altenburg, and the park laid out around 1880, with garden house, fountain and grotto, is still recognisable as a broad park.

Between 1805 and 1816 a cotton spinning mill operated on the castle grounds, a surprising industrial use for a medieval noble residence. This episode reveals how flexibly such fortifications were adapted to changing needs across different centuries.