Saint Adelelmus, O.S.B. (died c. 1100), also known as Aleaunie and Lesmes, was a French-born Benedictine monk venerated as a saint in the Roman Catholic Church. Born in Loudun, Poitou, he joined the military at a young age; he went on duty before making a pilgrimage to Rome. During his pilgimage he met Saint Robert of Molesme and left the military life for the Benedictine order.