Sir Thomas Howard, 3rd Duke of Norfolk, 2nd Earl of Surrey, 14th Baron Segrave, 13th Baron Mowbray KG, Earl Marshal (1473 – 25 August 1554) is a prominent Tudor politician.

He is uncle to Anne Boleyn and Catherine Howard, two wives of King Henry VIII, and plays a major role in the machinations behind these relationships.

After falling from favor, he is stripped of his dukedom and imprisoned in the Tower of London, avoiding execution when the king dies.

He is released on the accession of Queen Mary I.

He aids Mary in securing her throne, setting the stage for alienation between his Catholic family and the Protestant royal line that will be continued by his great-niece, Queen Elizabeth I.