William J. Campbell

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