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
This disambiguation page lists articles about people with the same name.
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