Sir Thomas Howard, 4th Duke of Norfolk, 4th Earl of Surrey, 15th Baron Segrave, 14th Baron Mowbray KG, Earl Marshal (10 March 1536 – 2 June 1572) is an English nobleman.

Norfolk is the son of the poet Henry Howard, Earl of Surrey.

He is taught as a child by John Foxe, the Protestant martyrologist, who remains a lifelong recipient of Norfolk's patronage.

His father predeceases his grandfather, so Norfolk inherits the Dukedom of Norfolk upon the death of his grandfather, Thomas Howard, 3rd Duke of Norfolk, in 1554.

Norfolk is a second cousin of Queen Elizabeth I of England through her mother's family and is trusted with public office despite his family's history and (although he claims to be a Protestant) his prior support for Catholicism.