William Cavendish
William Cavendish may refer to:
Earls
- William Cavendish, 1st Earl of Devonshire
- William Cavendish, 2nd Earl of Devonshire
- William Cavendish, 3rd Earl of Devonshire
Dukes
- William Cavendish, 1st Duke of Newcastle
- William Cavendish, 1st Duke of Devonshire
- William Cavendish, 2nd Duke of Devonshire
- William Cavendish, 3rd Duke of Devonshire
- William Cavendish, 4th Duke of Devonshire, British prime minister
- William Cavendish, 5th Duke of Devonshire
- William Cavendish, 6th Duke of Devonshire
- William Cavendish, 7th Duke of Devonshire
- William Cavendish-Bentinck, 3rd Duke of Portland
- William Cavendish-Scott-Bentinck, 5th Duke of Portland
Others
- William Cavendish (courtier), English courtier
- William Cavendish (English politician, born 1783), son of Lord George Augustus Henry Cavendish, later 1st Earl of Burlington
- William Cavendish, 2nd Baron Chesham
- William Cavendish, Marquess of Hartington, son of Edward Cavendish, the 10th Duke and elder brother of the 11th
- William Cavendish, Earl of Burlington, son of Peregrine Cavendish, 12th Duke of Devonshire
- William Hunter Cavendish, colonial pioneer