Limburg Castle, Medieval castle ruins in Sasbach am Kaiserstuhl, Germany

Limburg Castle, also called Limpurg, is a ruined hilltop castle on the Limberg, a 272 m spur of the Kaiserstuhl, 40 m above the Rhine in Sasbach am Kaiserstuhl. Its core measured 40 by 80 m across three terraces: a well and buildings on the lower, representative dwellings on the middle, and a bergfried with attached residence on the upper. Walls up to two metres thick and substantial wall courses survive.

First documented between 1215 and 1221 as a successor to the nearby Alte Limburg, the castle was called castrum de Limberch in 1239. It passed from the Zähringen to the Habsburgs, and owners included the counts of Tübingen from 1498 to 1590. Still habitable in the 16th century, it was a ruin by 1701; in 1945 bombing destroyed much of the bergfried.

The castle's name appears in records as "castrum de Limberch" in 1239, and older literature also calls it Burg Lindberg. Its role was to watch over the Rhine crossing, and today the preserved wall lines let visitors trace how the three terraces were used.

The ruins can be reached via several hiking trails departing from Sasbach am Kaiserstuhl, each offering different difficulty levels. The climb is demanding, but hikers are rewarded with expansive views and should bring sturdy footwear.

The claim that Rudolf of Habsburg was born at Limburg in 1218 rests on an unverified statement by Fugger-Birken, not on contemporary sources; Abbot Martin Gerbert discussed it in his 1772 Codex epistolaris Rudolphi I. In 1945 bombing destroyed major parts of the bergfried.