William Cavendish
William Cavendish is the name of the following people:
- William Cavendish, 1st Earl of Devonshire (1552–1626), English nobleman and politician
- William Cavendish, 2nd Earl of Devonshire (1591–1628), English nobleman and politician
- William Cavendish, 1st Duke of Newcastle (1592–1676), English nobleman, general and politician
- William Cavendish, 3rd Earl of Devonshire (1617–1684), English nobleman and politician
- William Cavendish, 1st Duke of Devonshire (1640–1707), English nobleman and politician
- William Cavendish, 2nd Duke of Devonshire (1672–1729), British nobleman and politician
- William Cavendish, 3rd Duke of Devonshire (1698–1755), British nobleman and politician
- William Cavendish, 4th Duke of Devonshire (1720–1764), British nobleman and politician
- William Cavendish, 5th Duke of Devonshire (1748–1811), British nobleman and politician
- William Cavendish, 6th Duke of Devonshire (1790-1858), British nobleman and politician
- William Cavendish, 7th Duke of Devonshire (1808-1891), British nobleman and politician
- William Cavendish, Marquess of Hartington (1917–1944), British nobleman
- William Cavendish-Bentinck (1774–1839), British general and statesman
- William Cavendish-Bentinck, 3rd Duke of Portland (1738–1809), British nobleman and politician
- William Cavendish-Bentinck, 6th Duke of Portland (1857–1943), British nobleman and politician
- William Cavendish-Bentinck, 7th Duke of Portland (1893–1977), British nobleman and politician
