John A. Campbell may refer to:
John Archibald Campbell (1811–1889), U.S. Supreme Court justice and Confederate official John Allen Campbell (1835–1880), first Governor of the Wyoming Territory John A. Campbell (Manitoba politician) (1872–1963), Manitoba politician John Angus Campbell (born 1942), U.S. professor of rhetoric John A. Campbell (lumber executive) John Argentine Campbell (1877–1917), Scottish rugby union player
See also John Campbell (disambiguation)