Duke of Beaufort is a title in the Peerage of England. It was created by Charles II in 1682 for Henry Somerset, 3rd Marquess of Worcester, a descendant of Charles Somerset, 1st Earl of Worcester, legitimised son of Henry Beaufort, 3rd Duke of Somerset, a Lancastrian leader in the Wars of the Roses. The name Beaufort refers to a castle in Champagne, France. It is the only current dukedom to take its name from a place outside the British Isles.

Henry Somerset, 1st Duke of Beaufort, KG, PC was an English politician who sat in the House of Commons at various times between 1654 and 1667, when he succeeded his father as 3rd Marquess of Worcester. He was styled Lord Herbert from 1644 until 3 April 1667. The Dukedom of Beaufort was bestowed upon him by King Charles II in 1682.