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 pilgrimage he met Robert of Molesme and left the military life for the Benedictine order. After death, Adelelmus became the patron saint of the city of Burgos in Spain. No longer observed in the General Roman Calendar, Adelelmus' feast day is kept on 30 January.