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John VI of Harcourt (or John of Vaudémont) (1 December 1342 – 28 February 1389) was a count of Harcourt. He was son of John V of Harcourt and Blanche of Ponthieu who was the sister of Jeanne of Ponthieu.
- Charles (1366–1384)
- John VII (1370–1452)
- Louis (1382–1422), viscount of Châtellerault and lord of Aarschot in Mézières, archbishop of Rouen
- Blanche (died 1431), abbess of Fontevraud
- Isabelle (1371–1443), in 1383 married Humbert VI of Thoire en Villars
- Jeanne (1372–1456), dame of Montaigle, in 1393 married William II of Namur
- Marie, in 1405 married Reinald IV, Duke of Guelders and Jülich (died 1423) and in 1426 married Rupert (died 1431), son of Adolf, Duke of Jülich-Berg
- Catherine, nun
- Marguerite (born 1378, date of death unknown), dame of Longueville and of Plaines, married John II lord of Estouteville, mother of Guillaume d'Estouteville
- Jeanne, nun.
- Autrand 1994, p. 865.
- Autrand, Francoise (1994). Charles V: Le Sage (in French). Fayard.