Guigues IV or Guy IV was the count of Forez, Auxerre and Tonnerre from 1203 and the count of Nevers from 1226. He was still a child when his father, Guigues III, died on the Fourth Crusade and he inherited Forez. His mother was Alix and his uncle, Renaud, archbishop of Lyon, acted as regent until he came of age in 1218.