Frauenberg, Medieval castle ruins in Ebsdorfergrund, Germany.

Frauenberg is a medieval castle ruin perched on a basalt hill in the Ebsdorfergrund area of Hesse, Germany. Stone walls and foundations are still standing, and the elevated position opens up a broad view over the valley below and the surrounding woodland.

Sophie of Brabant, daughter of Saint Elisabeth, had the castle built around 1250 to secure Marburg, counter the Mainz castle of Amöneburg and watch the "Langen Hessen" road. It is first documented in 1296. It lost strategic value by 1437, was destroyed in 1470 and 1489, and was partly inhabited until 1528 before locals used it as a quarry.

The castle gave its name to the lords who held it: ministeriales who settled there called themselves von Frauynberg, probably a branch of the Rau von Holzhausen. The castle also gave rise to the court of Frauenberg, which became an office in 1350 and was merged with the Kirchhain office in 1604.

The ruin stands on the 379 m basalt cone of the Frauenberg, about 500 m southwest of the village of Frauenberg and 6 km south of Marburg. The surrounding Frauenberg bei Beltershausen nature reserve protects the slope where basalt was quarried until 1913. The fenced wall of the ruin gives a wide view over the Ebsdorfer Grund and the Amöneburg basin.

The castle had no bergfried of the classic kind, and its original appearance is uncertain. What survives is a seven-metre inner ring wall, an outer wall and several moat-and-bank ditches. Basalt was quarried on the Frauenberg until 1913; the hilltop is now the Frauenberg bei Beltershausen nature reserve.