William Knight
William Knight is the name of:
- Bill Knight, racing driver and speed record setter
- Bill Knight (born 1947), former Canadian Member of Parliament and financial executive
- William Angus Knight (1836–1916), British writer, professor, and philosopher
- William Frederick Knight, voice actor
- William Payne Knight
- William W. Knight, Pennsylvania politician
- William J. Knight (1929–2004), X-15 pilot and U.S. politician
- William Henry Knight (died 1863), British painter
- William Knight (pirate), English buccaneer
- William Knight (racehorse trainer)
- William Knight (footballer), English football goalkeeper with Southampton (1911–1913)
- William Knight (martyr) (1572–1596), Venerable William Knight, martyred in 1596
- William Knight (bishop) (1475–1547), member of the court of Henry VIII, and Bishop of Bath and Wells
- Billy Knight (tennis), reached quarter final of French open in 1959
- Billy Knight (boxer), British boxer
- Willy Knight, fictional Timeline-191 series character
- William R. Billy Knight (born 1952), American basketball player