William Kirby

William Kirby may refer to:

• William Kirby (entomologist) (1759–1850), English entomologist
• William Kirby (author) (1817–1906), Canadian author
• William C. Kirby (born 1950), professor at Harvard University
• William F. Kirby (1867–1934), American politician
• William Forsell Kirby (1844–1912), English entomologist & folklorist
• William T. Kirby (1911–1990), businessman
• William Kirby (Gaelic footballer) (fl. 1990s–2010s), Gaelic footballer
• William Kirby (footballer, born 1883) (1883–1917), English footballer
• William Kirby (cricketer) (born 1981), English cricketer
• Bill Kirby (born 1975), Australian swimmer
• Cam Kirby or William J. Cameron Kirby (1909–2003), Canadian politician