Château de Rathsamhausen, Medieval castle in Ottrott, France.

Château de Rathsamhausen is a ruined hilltop castle in Ottrott, Alsace, built of red stone. Its four-storey rectangular keep measures about 11.9 by 16.1 metres and stands 18 metres high, with walls 1.8 metres thick. Beside it are a round bergfried, several outbuildings, a ring wall, a zwinger and a barbican. The keep's top is crenellated, and the round tower has small square openings near its top.

The castle began as a wooden structure in the 11th century and was rebuilt in stone following a fire around 1100. Major reconstruction work took place in the 13th century to strengthen the fortification's defenses.

The castle was split in the early 13th century, and a moat was dug to cut the keep off from the rest of the site. From 1561 the complex carried the names Hinterlutzelbourg and Rathsamhausen, and the family coat of arms was placed in the dwelling. A bronze "bâton à feu" from the late 14th century was found here.

The ruins are reached from the Klingenthal parking area by following marked Club Vosgien trails toward the Ottrott castles site. The climb involves moderate elevation gain and requires sturdy footwear and enough time to account for both the ascent and descent.

Excavations at the castle site uncovered a 14th-century bronze fire stick, offering rare material evidence of weaponry used during the medieval period. This artifact represents one of the few surviving objects that testify to the actual arms employed to defend the fortification.