The Griffin School is a school of witchers appearing in The Witcher graphic novels. Though it is never described in detail, it is mentioned when Leo Bonhart displays his personal trophies of the witchers he has apparently slain, including a Cat, a Griffin and a Wolf medallion.
While none of the school's adherents are named in the books, George the Dragonslayer, a witcher mentioned in The Witcher (PC), was revealed to have been a member of the Griffin School in The Witcher 3: Wild Hunt.
Griffin School equipment is of medium weight and amplifies the intensity of the wearer's Signs; as such, it is heavily implied that the school and its disciples may have specialized in the use of magic. Griffin witchers may also possess higher standards of social etiquette compared to other schools, which was mentioned in the Dragonslayer's treasure hunt quest, though this might have referred to George specifically.