Burg Ehrenstein, Castle ruins in Ehrenstein, Germany

Burg Ehrenstein is a small ruin on a slope about 25 metres above the Mehrbach, next to Kloster Ehrenstein. Its most visible element is the outer artillery tower rising from the trees; the central five-sided residential tower survives mainly on its reinforced attack side, while the gatehouse facing the monastery is barely traceable.

Burg Ehrenstein was first documented in 1331 as the property of Rorich von Uetgenbach (1312–1345), who then called himself Herr zu Ehrenstein. It later passed to the lords of Nesselrode, who held it until they gave up ownership in 1993. Swedish troops destroyed the castle during the Thirty Years' War, and it was never rebuilt.

The ruin gave its name to the Ehrenstein district of Asbach and stands directly beside Kloster Ehrenstein, which visitors see from the artillery tower. Rorich von Uetgenbach, first recorded in 1331, called himself Herr zu Ehrenstein after the castle. The Nesselrode family held the site until 1993, when they gave up ownership and it was struck from the land register as ownerless.

The ruin stands about 25 metres above the Mehrbach stream, on a slope directly beside Kloster Ehrenstein, and is freely accessible on foot. The ground is uneven and partly wooded, so sturdy shoes help. Restoration work has been ongoing since 2007, and some sections may be fenced off.

The ruin has been listed as ownerless since 1993, when it was struck from the land register after the Nesselrode family gave up ownership. Restoration since 2007 is funded by the Ortsgemeinde and Verbandsgemeinde Asbach together with state money; the northeast ring wall was fully rebuilt by 2010.