William Cavendish, Marquess of Hartington
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There have been at least two people called "William Cavendish" who have had the courtesy title of "Marquess of Hartington":
- William John Robert Cavendish, Marquess of Hartington (December 10 1917–September 10 1944) son of the 10th Duke and elder brother of the 11th, killed in World War II.
- William Cavendish, Marquess of Hartington (born June 6 1969), son of the 12th Duke and Heir Apparent to the Dukedom of Devonshire, a photographer.