Guillaume de Donjeon (c. 1140 – 10 January 1209) was a French Roman Catholic prelate who served as the Archbishop of Bourges from 1200 until his death. He served as a canon in Soissons and Paris before he entered the Order of Grandmont. Sometime later he entered the Cistercians. He was known to practice austerities such as abstaining from meat and wearing a hair shirt. His canonization was celebrated under Pope Honorius III in 1218 and he was named as the patron saint for the Parisian college.