John Harper

John Harper may refer to:

• John Harper (politician) (1930–2001), American politician from Kentucky
• John Adams Harper (1779–1816), American politician from New Hampshire
• John L. Harper (1925–2009), British biologist
• John Harper (pastor) (1872–1912), British Baptist pastor who died on the Titanic
• John Russell Harper (1914–1983), Canadian art historian
• John William Harper (1916–1944), English recipient of the Victoria Cross
• John Harper (mayor), mayor of Denver, Colorado, U.S.A, 1871–1872
• Johnny Harper, fictional character in The O.C.
• John Ernest Harper (1874–1949), British admiral
• John Harper (computer engineer) (born 1937), British computer engineer who led the Bombe rebuild at Bletchley Park
• John Joseph Harper (died 1988), Canadian aboriginal leader from Wasagamack, Manitoba
• John Harper, former director of the Royal School of Church Music