Burgruine Pfannenstiel, Donautal, Medieval castle ruin in Beuron, Germany.

Burgruine Pfannenstiel is a medieval castle ruin situated on a hilltop in the Danube valley. The remains feature a rectangular residential tower, thick defensive walls, and evidence of a former moat system.

Shards and masonry suggest the castle was built in the second half of the 13th century; the builders are not recorded. By around 1400 it stood empty and belonged to the Lords of Urbach. Through Margarethe von Urbach it passed to Georg I. von Werenwag, who sold the castle site in 1476 to Beuron Abbey and Hans Spretter von Mühlheim. The abbey's holdings, including the ruin, went to the Princes of Hohenzollern-Sigmaringen in 1803.

Oral tradition says a nocturnal lightning strike set the castle alight; a knight's daughter died in the fire after ordering a servant to drown her younger brother. The servant instead gave the child to an old woman in the Bära valley, and the grown brother later built Kreidenstein castle on the neighbouring rock.

The ruins are reached via walking paths that start from the eastern plateau known as Hart, located between the Danube and Bara valleys. These trails provide a straightforward approach for exploring the site on foot.

The core of the ruin is a donjon stump about 5.5 metres high, roughly 23 metres long and 11.5 to 12 metres wide, with walls up to 2.7 metres thick and an interior of some 145 square metres. In its southeast wall a breach about 7 metres high marks the former entrance from the trapezoidal courtyard, reached by a drawable wooden stair or a fixed ramp.