Burg Wittelsbach (Castle of Wittelsbach) was a castle near Aichach in today's Bavarian Swabia.
The castle was first mentioned around the year 1000. In 1119, Count Otto III of Scheyern moved into the castle of Wittelsbach. The castle's name, "Witilinesbac", is however already mentioned as the place of origin of Otto III in a document by Henry V dating from 1115. From 1120, the Counts of Scheyern styled themselves Counts Palatine of Wittelsbach. The castle thus became the ancestral seat of the House of Wittelsbach.
According to local tradition, the castle was destroyed in 1209 after count Otto of Wittelsbach had murdered King Philip of Swabia and never rebuilt. An archaelological excavation from 1978 to 1980 did not find evidence of a sudden destruction of the castle, however - from the archaeological evidence, it appears the castle's walls were used as a quarry after the castle itself was given up.
In the 15th century, a Gothic church was built on the former castle site. The church, still standing today, became the nucleus of the village of Oberwittelsbach. In 1834, the Wittelsbach family erected a monument to the state of Bavaria on the former site of their ancestral castle. In memory of the castle, parts of the district Aichach-Friedberg are today called Wittelsbacher country.