Burg Treuchtlingen, Medieval castle ruins in Treuchtlingen, Germany.

Burg Treuchtlingen is a medieval castle ruin perched on a rocky hill with remaining walls and a tower. The structures display traditional German defensive architecture featuring Romanesque elements visible in the stonework.

The castle was built in the 12th century to serve as a strategic stronghold for local nobility. It controlled important trade routes through the Bavarian countryside and influenced regional power dynamics for centuries.

The name "Obere Veste" distinguishes the hilltop castle from the "Niedere Veste", the valley castle in the town that was rebuilt as a Renaissance palace in 1575. The hilltop site lost its residential role after 1453, when Barbara von Pappenheim acquired it and the complex was left to decay. Since 1975 the Fördergemeinschaft Burg Treuchtlingen e. V. has restored and partly reconstructed the walls.

The ruin sits west of Treuchtlingen at the start of the Altmühltal Nature Park, on a southeast-facing spur beside the B2. A deep neck ditch separates it from the ridge to the northwest; the slopes fall steeply into the valley. The terrain has been levelled and altered, so the original layout is hard to read.

The small artificial castle ruin on the southeastern slope was built in 1905/06 as a crown for a new water reservoir and was sometimes mistaken for the real hilltop castle hidden by trees. A second reservoir was later built into the neck ditch.