William Cavendish, 4th Duke of Devonshire, styled Lord Cavendish before 1729, and Marquess of Hartington between 1729 and 1755, was a British Whig statesman and nobleman who was briefly nominal Prime Minister of Great Britain. He was the first son of William Cavendish, 3rd Duke of Devonshire and his wife, Catherine. He is also a great-great-great-great-great-grandfather of King Charles III through the king's maternal great-grandmother, Cecilia Bowes-Lyon, Countess of Strathmore and Kinghorne.
- Occupation
- politician
- Position held
- Prime Minister of the United Kingdom, Member of the Privy Council of Ireland, member of the 9th Parliament of Great Britain, member of the 10th Parliament of Great Britain
- Citizenship
