The title of Duke of Grafton was created in 1675 by Charles II of England for his 2nd illegitimate son by the Duchess of Cleveland, Henry Fitzroy. The most famous duke was probably Augustus Henry Fitzroy, 3rd Duke of Grafton, who served as prime minister in the 1760s.

The Duke of Grafton holds three subsidiary titles, all created in 1672 in the peerage of England: Earl of Euston, Viscount Ipswich, and Baron Sudbury of Sudbury. The Duke's eldest son and heir uses the courtesy title Earl of Euston.

Dukes of Grafton (1675)