Maulbronn Monastery (German: Kloster Maulbronn) is the best-preserved medieval Cistercian monastery complex in Europe. It is situated on the outskirts of Maulbronn, Baden-Württemberg, Germany and is separated from the town by fortifications. Since 1993 the monastery is part of the Unesco World Heritage.

The monastery was founded in 1147 under the auspices of the first Cistercian pope, Eugenius III. The main church, built in a style transitional from Romanesque to Gothic, was consecrated in 1178 by Arnold, Bishop of Speyer. A number of other buildings — infirmary, refectory, cellar, auditorium, porch, south cloister, hall, another refectory, forge, inn, cooperage, mill, and chapel — followed in the course of the 13th century. The west, east and north cloisters date back to the 14th century, as do most fortifications and the fountain house.

After the Reformation broke out, Ulrich, Duke of Württemberg, seized the monastery in 1504, later building his hunting lodge and stables there. The monastery was pillaged repeatedly: first by the knights under Franz von Sickingen in 1519, then again during the German Peasants' War six years later. In 1534, Duke Ulrich secularised the monastery, but the Cistercians regained control — and Imperial recognition — under Charles V's Augsburg Interim. In 1556, Christoph, Duke of Württemberg, built a Protestant seminary, with Valentin Vannius becoming the first abbot two years later; Johannes Kepler studied there 1586–89.