La Lucerne Abbey (Abbaye Sainte-Trinité de La Lucerne) is a Premonstratensian monastery situated in the forests of the Thar valley in the Manche department, near the commune of La Lucerne-d'Outremer, in France. La Lucerne was the mother-house of four other Premonstratensian monasteries: Ardenne Abbey, Mondaye Abbey and Belle-Étoile Abbey (at Cerisy-Belle-Étoile) in Normandy, and Beauport Abbey in Brittany. Major structural renovations were carried out in the 15th and 17th centuries.