William J. Campbell may refer to:
William James Campbell (1850–1896), state senator and Lieutenant Governor of Illinois William Joseph Campbell (1905–1988), U.S. federal judge from Illinois Bill Campbell (California politician) (born 1942), Republican politician from California William John Campbell, mayor of Freetown, Sierra Leone William J. Campbell (general) (1931–2017), American Air Force general William Joseph Campbell (meteorologist) (1930–1992), American meteorologist See also William Campbell (disambiguation)