The Duke of Newcastle-under-Lyne is a title in the British peerage, created in 1628. It is associated with the town of Newcastle-under-Lyne in Staffordshire, England. The title has been held by several notable individuals, primarily from the Cavendish family, who have played significant roles in British politics and society. The current holder of the title is Henry Pelham-Clinton, the 10th Duke, who succeeded in 1988. The dukedom is part of the larger Newcastle family legacy, which includes various other titles and estates, contributing to the rich history of the British aristocracy.