The Carmelite monastery in Geldern was the most important of the five medieval monasteries in Geldern on the lower Lower Rhine. It existed from 1306 to 1802.
The monastery was founded in 1306 by Count Rainald I von Geldern. Numerous modifications to the monastery church of St. Maria Magdalena and the Carmelite monastery itself have been handed down from 1339. In honor of the elevation of Count Rainald II, the founder's son, to the ducal rank, the convent was expanded in 1340 and a cloister was built. During the War of the Spanish Succession, Geldern was bombed by the Prussians in 1703 and besieged for eight months. The monastery was also damaged. After the Rhineland was occupied by French troops, the monastery was secularized in 1802 and the monastery church was converted into a parish church. After 1808, most of the monastery buildings were gradually demolished. Only the pastorate building has survived to this day. The city library, built in 1969, now stands on parts of the foundations of the former Carmelite monastery.
The Carmelite monastery in Geldern was the home of Gottfried von Greveray (1415–1504), the auxiliary bishop in Cambrai, who gave the city of Geldern the relics of the two Saints Galenus and Valenus in 1478 (see Ten Thousand Martyrs). Since then, the two martyrs have been considered the patron saints of the city of Geldern.
The extensive monastery archive is now kept in the main state archive in Düsseldorf.