Liebenzell Castle (German: Burg Liebenzell) is a hill castle on a sloping hill spur on the sides of the Schlossberg ("castle hill") above the town of Bad Liebenzell in the district of Calw in the south German state of Baden-Württemberg.

The fortification was once the most important castle in the Württemberg part of the Black Forest.

In 1196 the counts of Eberstein were recorded as the castle's owners.

The castle comprises an irregular, pentagonal fortification with a mighty shield wall, into which a square bergfried with a garderobe has been integrated.

The great hall (Palas) is decorated with ornamental ogival openings (Spitzbogenöffnungen).