Ruine Ringelstein, Medieval castle ruin in Ringingen, Germany.

Ringelstein is a castle ruin in Ringingen in Baden-Württemberg that stands on a rocky hill at 870 meters elevation between Ringingen and Burladingen. The stone remains form the basic structure of a medieval residential tower that once rose several meters above ground and has been partially worn away by erosion.

Built in the second half of the 12th century, as datable pottery finds show, the castle was first mentioned in 1274 as Ringenstein. Lords named Sigibold or Swigger von Ringelstein and, from 1318 to 1332, Albrecht Hagge von Ringelstein are recorded. Pottery finds place the castle's end in the second half of the 14th century, though a Kaspar von Ringelstein still appears in 1440.

The pentagonal residential tower shows medieval building methods through its mix of rough stones and cut blocks in different sections. The different ways stones were worked reveal various construction phases and repairs across the centuries.

The ruin can be reached from Ringingen via marked hiking trails that follow good paths up the hill. The surrounding area is green and relatively quiet, with the best time to visit during sunny weather when the south-facing exposure makes the views clearer.

The tower's irregular pentagonal plan measures up to ten metres long and seven wide, with a stepped foundation following the ten-metre drop of the rock spur. A beam hole inside still marks two storeys, and fragments of hollow bricks and clay show a third, timber-framed level once carried a tiled roof.