Others
- William Angus Knight (1836–1916), British writer, professor, and philosopher
- William Frederick Knight, voice actor
- William Henry Knight (1823–1863), British painter
- William Knight (pirate), English buccaneer
- 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
- William W. Knight (publisher), lawyer, state legislator, publisher of The Oregon Journal
- Willy Knight, fictional Timeline-191 series character
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