Gelduin (died 1123) was a Benedictine monk who served as the third abbot of Anchin from 1102 to 1109.
He became a monk at Saint-Vincent de Laon and then abbot of Saint-Michel en Thiérache.
In 1102, Abbot Haymeric died and the monks elected Gelduin to succeed him.
In 1104 and 1105, he obtained bulls from Pope Paschal II confirming the monastery's spiritual and temporal jurisdiction, including over the priories of Aymeries [fr] (founded 1088) and Hesdin (1094).
[3] In 1109, Gelduin retired a second time to live the speculative life in the Abbey of Saint-Bertin.