Thurstan of Caen was a Norman monk from the Abbey of Saint-Étienne, Caen who served as abbot of Glastonbury from c. 1077 to his death, some time between 1096 and 1100. He is chiefly notable for his aggressive introduction of new ecclesiastical practices, unwelcome to his Anglo-Saxon monks, and for its terrible consequences. In 1083 tension culminated in a massacre in which Thurstan's men-at-arms killed either two or three monks and wounded either fourteen or eighteen. He was returned to Normandy in disgrace, but is in later years found at the English royal court where he continued as Glastonbury's abbot in absentia.