William Parnell

William Parnell may refer to:


 * William R. Parnell (1836–1910), Irish-born adventurer and soldier
 * William Parnell (architect) (died 1886), English architect
 * William Parnell (cricketer) (1837–1879), British Army officer and cricketer
 * Bill Parnell (1928–2008), Canadian middle distance runner