John Harper

• 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.

• 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

• 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

• Jack Harper (disambiguation)
• Jon Harper (born 1978), British musician

{{hndis|Harper, John}}