Joan of Ponthieu, Dame of Epernon, French noblewoman
Jeanne de Ponthieu, dame d'Épernon, Countess of Vendôme and of Castres (Jeanne de Ponthieu, dame d'Épernon, comtesse de Vendôme et de Castres, before 1336 – 30 May 1376) was a French noblewoman, the youngest daughter of Jean II de Ponthieu, Count of Aumale. She was the wife of Jean VI de Vendôme, Count of Vendôme and of Castres. She acted as regent for her infant granddaughter Jeanne, suo jure Countess of Vendôme from 1371 until the child's premature death in 1372.