Saint Adelin of Séez (also, Hadelin, Adelheim, Adelhelm, or Adalhelmus) (died c. 910) was a Benedictine monk and later abbot at the abbey of Anisole. He was the bishop of Séez for twenty-six years from 884. He is noted in Catholic Encyclopedia for being the author of a work on the life and miracles of Saint Opportuna (Vita et miracula Sanctae Opportunae).
See also 
- ^ The monastery of Anisole, Maine, was founded by the hermit Calevisus (Saint Calais, 460-541), to whom the monastery was later rededicated, and from whom the town of Saint-Calais took its name. William de St-Calais (d.1096) was prince-bishop of Durham.
- ^ Jones, Terry. "Hadelin". Patron Saints Index. Retrieved 2007-04-25.
- ^ Goyau, Georges (1912). "Seez". The Catholic Encyclopedia 8. Robert Appleton Company. Archived from the original on 14 May 2007. Retrieved 2007-04-25.