Others
- William Cavendish (courtier) (1505–1557), English courtier
- William Cavendish (1783–1812), son of Lord George Augustus Henry Cavendish, later 1st Earl of Burlington
- William Cavendish, 2nd Baron Chesham (1815–1882)
- William Cavendish, Marquess of Hartington (1917–1944) son of Edward Cavendish, the 10th Duke and elder brother of the 11th
- William Cavendish, Earl of Burlington (born 1969), son of Peregrine Cavendish, 12th Duke of Devonshire
- William Hunter Cavendish, colonial pioneer
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