Hunnesrück Castle, Medieval castle ruins in Dassel, Germany.

Hunnesrück Castle is a medieval ruin situated on a hilltop near Dassel, with visible remains of defensive walls, moats, and earth fortifications. The site reveals how structures were built and positioned to defend territory in the Middle Ages.

The counts of Dassel probably built Hunnesrück in the 1270s after their county was divided, as a replacement for an older castle on the Ellenser Wald. It is first documented in 1310, when Simon of Dassel sold the rest of the county to Bishop Siegfried of Hildesheim. From 1310 to 1523 it was the only castle in the Hildesheim exclave of Dassel and seat of the Amt Hunnesrück. In 1521 troops of Dukes Erich I and Henry the Younger bombarded and took it; its stone was reused for Erichsburg in 1527–1530.

The ruins reflect how medieval builders designed fortifications to protect settlements in this region. Visitors walking through can sense how important such castles were to local communities and their security.

The site can be explored on foot using marked paths that lead through the ruins and give a sense of the old fortifications. Wear sturdy shoes since the terrain is uneven in places and some sections may be difficult to navigate.

In 1367 the castle provided Bishop Gerhard von Berg with a contingent of knights for the Battle of Dinklar, contributing to his victory. The castle was the only one in the Dassel exclave of the Hildesheim bishopric, which lasted from 1310 to 1523.