Burg Granegg, Medieval castle ruin in Wißgoldingen, Germany.

Burg Granegg is a ruined hilltop castle on the Graneggle, a 200-meter-long west-facing spur of the Kalten Feld at 688 meters above sea level. The 60 by 22 meter site is cut off by a 4-meter-deep neck ditch. Visible remains include the foundation walls of a round bergfried with an outer diameter of 8.62 meters, an inner diameter of 3.62 meters and walls 2.50 meters thick.

The construction of Burg Granegg is dated to the 13th century based on its Buckelquader stonework; exact building dates, builders and owners are unknown. The lords of Stoffeln from nearby Weilerstoffel and the lords vom Holtz, ministeriales of the Rechberger with holdings in Tannweiler, Wißgoldingen, Winzingen and Christental, are sometimes named as possible castle lords, though unproven. It is unclear whether the castle was destroyed or abandoned; it is generally thought to have been short-lived and deserted by the 14th century. It is absent from Balthasar Riecker's hunting map of 1572 and the ruins were first mentioned again in 1674 by the Schwäbisch Gmünd chronicler Friedrich Vogt.

The ruins display Buckelquader stones in their walls, showing how medieval builders used locally available materials for construction. This building style was common in the region and shaped the appearance of many castles in Württemberg.

The ruin sits at elevation with open access, but it is best visited in dry weather since the path is steep and can become slippery. Sturdy footwear and some physical fitness help make the climb easier.

The location on the ridge offered an excellent vantage point for observing the Christental pass and the trade routes that passed through this narrow passage. This made the stronghold an important checkpoint for regional traffic.