Glanfeuil Abbey (Abbaye de Glanfeuil, also known as Abbaye de Saint-Maur-sur-Loire), was a French Benedictine monastery in Anjou. The village of Saint-Maur-sur-Loire is in the commune of Le Thoureil, in the diocese of Angers and the modern department of Maine-et-Loire. Glanfeuil claimed to be the oldest Benedictine foundation in Gaul. A scholarly view makes Rorgon I of Maine the founder or patron, in 824. Odo became abbot in the 850s. In 868 the monks of Glanfeuil founded a second monastery, at Saint-Maur-des-Fossés.