Adelelmus (died c. 1100) (French: Aléaume; Spanish: Lesmes) was a French-born Benedictine monk venerated as a saint in the Roman Catholic Church.

Born in Loudun, Poitou, Adelelmus joined the military at a young age.

During a pilgrimage to Rome he met Robert de Turlande, founder of the Abbey of La Chaise-Dieu, and left the military life for the Benedictine order.

[2] Queen Constance of Burgundy of Castile was impressed with the reports of Adelelmus' holiness, and invited him to live in Burgos, Spain.

[4] His remains lie in the Iglesia de San Lesmes Abad[5] Adelelmus' feast day is kept on 30 January; it is no longer observed in the General Roman Calendar.