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