William Lilly (disambiguation)
William Lilly (1602–1681) was an English astrologer and occultist.
William Lilly may refer to:
- William Lilly (congressman) (1821–1893)
- William Lily (grammarian) (1468–1522), English scholar and Latin grammarian
- William Samuel Lilly (1840–1919), English barrister and writer
- William Liley (1929–1983), New Zealand surgeon and perinatal physiologist