John Harper may refer to:
Arts and entertainment
- John Harper (actor) (died 1742), English comic actor
- John Harper (architect) (1809–1842), English architect
- John Russell Harper (1914–1983), Canadian art historian
- John Harper (church musician) (fl. 1998–2007), former director of the Royal School of Church Music
- Johnny Harper, fictional character in The O.C.
Politicians
- John Adams Harper (1779–1816), American politician from New Hampshire
- John Harper (mayor) (1825–1874), mayor of Denver, Colorado, U.S.A, 1871–1872
- John Harper (Kentucky politician) (1930–2001), American politician from Kentucky
- John Joseph Harper (1951–1988), Canadian aboriginal leader from Wasagamack, Manitoba
Others
- John Ernest Harper (1874–1949), British admiral
- John Harper (administrator) (1851–1932), railways commissioner in New South Wales
- John Harper (baseball) (fl. 1920s), Negro league baseball player
- John Harper (computer engineer) (born 1937), led the Bombe rebuild at Bletchley Park
- John Harper (footballer) (born 1883), Scottish footballer
- John Harper (gridiron football), Canadian football player
- John Harper (pastor) (1872–1912), British Baptist pastor who died on the Titanic
- John D. Harper (1910–1985), Industrialist and civic leader
- John L. Harper (1925–2009), British biologist
- John William Harper (1916–1944), English recipient of the Victoria Cross
See also
- Jack Harper (disambiguation)
- Jon Harper (born 1978), British musician
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