Others
- Willie Campbell (hurler) (born 1918), Irish hurler
- William Campbell (Australian politician) (1810–1896), Victorian pastoralist and politician
- William Alexander Campbell (born 1961), Australian vascular surgeon and former Wallabies rugby player
- William Stuart Campbell, Paul McCartney lookalike who according to urban legend took Paul's place in the Beatles after the latter's alleged death
- William John Campbell, Creole mayor of Freetown, Sierra Leone
- William Rickarby Campbell (1840–1918), New Zealand Presbyterian minister
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