Geoffrey II, de Château-Landon (died 1043 or 1046) was the Count of Gâtinais. He was the son of Hugues du Perche, Count of Gâtinais, by Béatrice de Mâcon, the daughter of Aubry II de Mâcon. About 1035 he married Ermengarde of Anjou, Duchess of Burgundy, daughter of Fulk III, Count of Anjou. After Geoffrey's death she married secondly Robert I, Duke of Burgundy.
Together, Geoffrey and Ermengarde had: