Thomas de Mowbray, 1st Duke of Norfolk, English politician, Earl Marshal of the United Kingdom (d. 1399)

Thomas de Mowbray, 1st Duke of Norfolk, KG (22 March 1366 – 22 September 1399) was an English peer. As a result of his involvement in the power struggles which led up to the fall of King Richard II, he was banished and died in exile in Venice.