Lindheim Castle, Medieval castle in Altenstadt, Germany

Lindheim Castle is a former medieval Ganerbenburg on a nearly square island formed by diverting the Mühlbach from the Nidder. Of the castle only small remains survive, including the Hexenturm, a small round tower in the inaccessible castle park. The Moller-Schlösschen, the only notable remnant of the 1697 schloss, keeps the west wing's core and was extended in 1841/42 by Georg Moller into a separate manor house with a tent roof and a small roof turret.

Lindheim was first recorded in 930 as a possession of the lords of Münzenberg. The first castle was probably destroyed in 1241; in 1289 King Rudolph allowed Conrad von Büches to build a new castle, though not on the same site. By 1324 it was held jointly by the von Büches, von Kransberg and von Bommersheim families, and in 1391 seventeen families agreed a Burgfrieden.

Lindheim was first recorded in 930 and was called a town by 1342, holding imperially immediate rights until 1806. The joint heirs had the village walled while they expanded the castle. The Moller-Schlösschen, the only substantial remnant of the 1697 schloss, carries a tablet commemorating writer Leopold von Sacher-Masoch, who lived in its side wing until his death in 1895.

The few surviving remains of the schloss are privately owned and not accessible; the Moller-Schlösschen, the Hexenturm round tower and the park are likewise closed to visitors. The site lies in the Nidder lowland at Lindheim, in the municipality of Altenstadt. The castle area is best viewed from the surrounding streets and paths.

The 1928 blaze that destroyed the schloss's main buildings also consumed the urn holding the ashes of writer Leopold von Sacher-Masoch, who had lived in the Mollersches Landhaus wing until his death in 1895; the urn was lost in the castle rubble. A plaque on the building still commemorates him.