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Rhys ap Gruffydd (1508–December 1531) was a powerful Welsh landowner who was accused of rebelling against King Henry VIII by plotting with James V of Scotland to become Prince of Wales. He was executed as a rebel. He married Lady Catherine Howard (b. abt 1499 Ashwellthorpe, Norfolk, England), the daughter of Thomas Howard, 2nd Duke of Norfolk and his second wife Agnes Tilney.
By this marriage, he became the uncle of Queen Anne Boleyn and Queen Catherine Howard, and granduncle of Queen Elizabeth Tudor.