Maria (Mary) Winifreda Francisca Howard, Duchess of Norfolk (née Shireburn or Sherburne; c. 1693 – 1754) was an English Catholic noblewoman, the last of the wealthy Shireburn family. She married twice, firstly to Thomas Howard, 8th Duke of Norfolk, from whom she became estranged before his death, and secondly to Peregrine Widdrington. She built a house in London on Arlington Street, which today is the clubhouse of the Royal Over-Seas League.