Derneburg Castle, Heritage castle in Holle, Germany

Derneburg Castle is a complex of pale-plastered, red-tiled buildings on a grassy slope in Holle, Lower Saxony. Its main range forms a rough rectangle, with two square towers capped by copper-green domes on the inner facade, one at each end of the longer wing. A lower, longer wing runs along the back, its roof rising to a small central cupola, while separate wings with steep red roofs and small dormers enclose a gravel yard. The monastery buildings were remodelled in the English-Gothic Tudor style in 1846–1848 by Georg Herbert Count of Münster with architect Georg Ludwig Friedrich Laves.

A manor at Derneburg was given to the Bishop of Hildesheim in 1130, but the Augustinian convent was only founded in 1213, when nuns from Holle moved there. Cistercians took over in 1443, and after secularisation in 1803 the estate passed to Ernst von Münster in 1815. His son Georg Herbert had the monastery rebuilt as a Tudor-style castle in 1846–1848.

The castle's name comes from the medieval convent that stood here, and the site has been open to visitors as a contemporary art venue since the Hall Art Foundation began showing its collection here. Andrew and Christine Hall own the complex, and the exhibition spaces sit within the former convent and castle buildings rather than in a purpose-built gallery.

The grounds are easy to explore on foot, with wide paths around the buildings and open areas between them. A visit in dry weather is recommended, as some of the artworks are located outside and the paths can be uneven in wet conditions.

The complex belongs to Andrew Hall and Christine Hall, who show the Hall Art Foundation's collection of contemporary art here. The grounds also hold structures from Count Ernst zu Münster's time: the 1827 Teetempel on the Donnerberg, a Greek-style pavilion with Doric columns and a fireplace, and his 1839 mausoleum, a steep Egyptian pyramid 10.51 m high.