Mary Percy may refer to: Mary Percy, Countess of Northumberland, née Talbot, (?–1572), English courtier and noblewoman Mary Percy (abbess) (1570–1642), English noblewoman Mary Percy Jackson, née Mary Percy, (1904–2000), English medical practitioner in Canada Mary Percy Schenck (1917–2005), American costume designer Mary Fitz (also Percy) (1596–1671), English noblewoman