Philippa de Mohun (c. 1367 – 17 July 1431) was Duchess of York, as a result of her third marriage to Edward of Norwich, 2nd Duke of York (c.1373–1415), Lord of the Isle of Wight, a grandson of King Edward III (1327–1377). She succeeded her third husband as Lady of the Isle of Wight (1415–1431).