Burgruine Hinterfrankenberg, Medieval castle ruins in Weigenheim, Germany.

Burgruine Hinterfrankenberg is a ruined hilltop castle on the Herrschaftsberg at 426 m above sea level, about 200 meters northeast above Burg Vorderfrankenberg. Its core consists of a two-part main castle with two eastern forecourts secured by dry ditches, a round bergfried, a palas, and an older ring wall of bossed ashlar. A double-tower gate from around 1430–40 stood on the northwest side, and from 1480 to 1488 a gatehouse with a narrow gate zwinger was built on the southwest side.

Built around 1166, the castle was destroyed on orders of Emperor Frederick Barbarossa and later rebuilt as a four-part complex with two main and two outer wards around 1200 by Bishop Konrad von Querfurt, first mentioned as a castrum in 1225. It fell into disrepair, was damaged in 1450 and burned in 1462, then rebuilt between 1481 and 1488 by cathedral provost Kilian von Bibra. In 1554 Margrave Albrecht Alcibiades destroyed it during the Margrave War, and from 1811 its remains were quarried away.

Locals call the ruin "Aldes Schloss" in the Franconian dialect. The gatehouse on the southwest side, built between 1480 and 1488, carried the date MCCCCLXXX (1480). A forester lived in the gatehouse around 1600.

The ruins are accessible by hiking trails from the parking area at the base of the hill. Visitors should wear sturdy shoes and exercise caution during wet weather, as the slopes are steep and paths can become slippery.

The castle was built around 1166 and is said to have been destroyed by Emperor Frederick Barbarossa as a robber baron's nest. Its remains were later built over by the ruins of Burgruine Probsteiwald, and parts of a double tower, a well and walls still survive on the plateau.