Áed Dub mac Colmáin was a 7th-century Irish monarch and cleric who served as the King of Leinster. A member of the Uí Dúnlainge dynasty, he was the son of Colmán Már and the brother of King Fáelán mac Colmáin. After renouncing his royal authority in the late 6th century, he dedicated himself to religious life at the monastery of Kildare. He eventually rose to hold the positions of both abbot and bishop within the community, serving as a significant ecclesiastical leader until his death in 639.