Oheb, Castle ruin in Proseč, Czech Republic.

Oheb is a castle ruin on a promontory above the Seč reservoir on the Chrudimka in the Chrudim district. Only small parts remain: a partly filled ditch on the northeast side, fragments of walls, a tower with traces of the entrance gate, and two artillery bastions. The whole area is now covered by forest.

The hill was first recorded in 1315, when the Vilémov monastery abbot mortgaged it to Hrabiš of Paběnice on condition that no castle be built. The castle itself was probably founded in the second half of the 14th century; it is first documented in 1405, when Ješek of Popovice and Oheb owned it. In 1468–1469 Hungarian troops damaged it, and it was repaired and enlarged under the Trčka family before being abandoned after 1490.

The castle ruins serve as a research site for medieval architecture and defense systems, contributing to understanding Czech fortification methods.

Access to the ruins is via a walking path of about one kilometer from the parking area near the dam. The trail is relatively level and clearly marked, making it straightforward for visitors to reach the elevated site.

The castle's name was forgotten so completely that at the end of the 17th century nobody knew where it had stood. It was only rediscovered in 1789, when Jaroslav Schaller listed it in his Topographie.