Burg Schwabsburg, Medieval castle ruins in Schwabsburg, Germany.

Burg Schwabsburg is a ruined hilltop castle on a spur above the Schwabsburg district of Nierstein. Only the square bergfried and parts of the ring wall remain. The tower's sides measure 10.2 to 10.4 metres at the base and 9.7 to 9.9 metres above a small setback; its walls are about 3.5 metres thick and faced with bossed ashlar blocks. The tower rises 24 metres at the north corner and 22.2 metres at the east corner to a viewing platform.

The castle was built around 1210 and served the powerful Staufer dynasty as a fortress in this strategic area. It was later damaged in military conflicts and never fully restored.

The name Schwabsburg survives in the surrounding Nierstein district, and the tower is known locally as the Rabenturm. The ruin is a designated cultural heritage monument of Rhineland-Palatinate. Visitors reach the viewing platform by a steel spiral staircase of sixty-five steps installed in 1963/64.

The site is easy to reach and offers access to the tower via an internal steel staircase. Climbing these stairs gives you a view over the surrounding landscape from an elevated position.

The tower's walls are faced with bossed ashlar blocks and are about 3.5 metres thick. The original high entrance still sits on the south-west side at a height of 11 metres, reached today by a steel spiral staircase of 65 steps installed in 1963/64.