Duke of Norfolk is a title in the Peerage of England. The premier non-royal peer, the Duke of Norfolk is additionally the premier duke and earl in the English peerage. The seat of the Duke of Norfolk is Arundel Castle in Sussex, although the title refers to the county of Norfolk. The current duke is Edward Fitzalan-Howard, 18th Duke of Norfolk. The dukes have historically been Catholic; during the 16th-19th centuries, therefore, members of the family were amongst the most prominent of English Catholic recusants.

All past and present dukes have been descended from Edward I. The son of Thomas Howard, 3rd Duke of Norfolk, was Henry Howard, Earl of Surrey; the earl was descended from Edward III. As all subsequent dukes after Thomas Howard, 4th Duke of Norfolk are descendants of the Earl of Surrey, this means they are also descended from Edward III.

The 2nd Duke of Norfolk was the grandfather of both Anne Boleyn and Catherine Howard and the great-grandfather of Queen Elizabeth I.

Before the Dukes of Norfolk, there were the Bigod Earls of Norfolk, starting with Roger Bigod from Normandy (died 1107). Their male line ended with Roger Bigod, 5th Earl of Norfolk, who died without an heir in 1306, so their titles and estates reverted to the crown. Edward II then granted his brother, Thomas of Brotherton, the title of Earl of Norfolk in 1312. It passed to Thomas's daughter (and granddaughter of Edward I), Margaret, and then to her grandson, Thomas Mowbray.

When Richard II made Thomas Mowbray the Duke of Norfolk in 1397, he conferred upon him the estates and titles (including Earl Marshal) that had belonged to the Earls of Norfolk. His elderly grandmother, Margaret, was still alive, and so at the same time she was created Duchess of Norfolk for life. Mowbray died in exile in 1399, months after his grandmother, and his dukedom was repealed. His widow took the title of Countess of Norfolk.

Between 1401 and 1476, the Mowbray family held the title and estates of the Duke of Norfolk. John de Mowbray, 4th Duke of Norfolk, died without male issue in 1476, his only surviving child being the 3-year-old Anne Mowbray. A marriage was arranged between Anne and Richard, Duke of York, the 4-year-old son of Edward IV. She remained Richard's child bride until she died at the age of 8.

In accordance with the marriage arrangements, Richard inherited the lands and wealth of the Mowbray family. He was also made Duke of Norfolk. However, upon the death of Edward IV, the throne was offered to Edward's brother, Richard III. After Prince Richard was lodged in June 1483 in the Tower of London, where his elder brother (briefly Edward V) was too, both Richard and Edward were declared illegitimate. They subsequently disappeared, and the titles of both York and Norfolk were forfeited to the crown.

This left John Howard, the son of Thomas Mowbray's elder daughter Margaret, as heir to the dukedom, and his support for Richard III's accession secured his creation as 1st Duke of Norfolk in 1483, in the title's third creation. From this point to the present, the title has remained in the hands of the descendants of John Howard, except for periods when it was temporarily forfeited.