Burgruine, Medieval castle ruin in Stadtsteinach, Germany.

Burgruine Nordeck is a ruined spur castle on a west-projecting ridge about 450 m above sea level in the Stadtsteinach forest, roughly two kilometres north-northeast of Stadtsteinach. Its remains consist of a round residential tower, a prison tower and some foundation walls. The site is freely accessible.

Burgruine Nordeck was built around 1100 by the Counts of Henneberg and acquired in 1151 by Bishop Eberhard II of Bamberg together with Steinach. It was destroyed in 1438 during the Waldenfels feud, rebuilt in the mid-15th century, and served as a seat of Bamberg officials; the robber baron Thomas von Absberg later hid kidnapped captives there. It was destroyed again in 1525 during the Peasants' War and abandoned.

The name Nordeck refers to the castle's position on a spur above the valley of the Untere Steinach near Mittelhammer. A legend tells of a merchant's son held captive by the robber knight Thomas von Absberg, who escaped with the cook's help. The site is freely accessible today.

The ruin stands about 2 km north-northeast of Stadtsteinach in the Stadtsteinacher Forst, on a west-projecting spur above the Mittelhammer hamlet in the Untere Steinach valley. It is freely accessible, but no marked trail or information panel is documented; the approach is on forest paths. The ground is uneven, with the remains of the round residential tower and the prison tower.

The castle's most notorious occupant was the robber baron Thomas von Absberg, who hid kidnapped captives here in the early 16th century. A legend tells of a merchant's son who escaped with the cook's help. In 1523 the Swabian League left the castle unmolested while its owner, Bamberg official Jörg von Wildenstein, held it; it was destroyed two years later in the Peasants' War.