Mary Arundell, Countess of Arundel (died 20 or 21 October 1557), was an English courtier. She was the only child of Sir John Arundell (1474 – 1545) of Lanherne, Cornwall, by his second wife, Katherine Grenville. She was a gentlewoman at court in the reign of King Henry VIII, serving two of Henry VIII's Queens, and the King's daughter, Princess Mary. She was traditionally believed to have been "the erudite Mary Arundell", the supposed translator of verses now known to have been the work of her stepdaughter, Mary FitzAlan, later the first wife of Thomas Howard, 4th Duke of Norfolk.