Fürstenfeld Abbey (German: Kloster Fürstenfeld) is a former Cistercian monastery in Fürstenfeldbruck (formerly known simply as Bruck) in Bavaria, Germany.
It is situated about 25 km north-west of Munich. The abbey was one of the household monasteries of the Wittelsbachs. The abbey church of the Assumption of the Virgin Mary is held to be a masterpiece of the late Baroque in southern Germany.
In 1256, Louis II, Duke of Bavaria (Louis the Severe) killed his first wife, Marie of Brabant (1226–1256) on suspicion of adultery (which later turned out to be unfounded), the penance for which, as imposed by Pope Alexander IV, was the foundation of a monastery. The first foundation at Seldental, at Tal near Aibling, in 1258, was afterwards moved to the present site near the town of Bruck in 1263. Papal permission for the new foundation to be settled by Cistercian monks from Aldersbach Abbey had been obtained as early as 1256, but was not confirmed by the Bishop of Freising until 1265, in which year the new abbey was at last settled.
Louis II endowed and privileged the new abbey very handsomely and when he died, was buried here. His son, Louis IV, Holy Roman Emperor, was also a great benefactor to the abbey, which supported him in his dynastic struggle against the Habsburger Frederick the Handsome. Emperor Louis IV died of a stroke at Puch nearby on 11 October 1347 during a bear hunt, and his heart was buried here. Both men named Louis are commemorated by elaborate Baroque monuments.