Gaucher IV de Châtillon
Gaucher IV de Châtillon (died c. 1261–1265) was the third son of Hugh I of Châtillon, count of Saint-Pol, and Mary of Avesnes, countess of Blois. In his father's 1246 inheritance settlement he received the family seat of Châtillon-sur-Marne.
By 1258 he had married Isabella of Lezinnes. He is last recorded in December 1260, and his son Gaucher V became constable of France and count of Porcien.