William A. Johnson may refer to:
William A. Johnson Jr. (born 1942), mayor of Rochester, New York William A. Johnson (Wisconsin politician) William Andrew Johnson (1858–1943), Tennessee pastry chef once enslaved by U.S. president Andrew Johnson William Allen Johnson, American organ builder William Arthur Johnson (biologist) (1816–1880), amateur biologist and clergyman in Canada William Arthur Johnson (biochemist) (1913–?), British biochemist
See also William Agnew Johnston, Kansas politician and judge William Johnson (disambiguation)