John Horner may refer to:
People John Francis Fortescue Horner (1842–1927), British barrister John M. Horner (1821–1907), founder of Union City, California John R. Horner (born 1946), American paleontologist John S. Horner (1802–1883), American politician John Horner (British politician) (1911–1997), British firefighter, trade unionist and politician John Horner (organist) (1899–1973), organist, choirmaster and music teacher in South Australia John Horner (police officer), American chief of police of Los Angeles in 1885 John Horner (Rector of Lincoln College, Oxford) (1792–?), Oxford college head Jack Horner (1927–2004), Canadian rancher, politician and cabinet minister
Fictional characters John Horner, in "The Adventure of the Blue Carbuncle", a Sherlock Holmes story by Sir Arthur Conan Doyle
See also Jack Horner (disambiguation) Johan Hörner (1711–1763), Swedish-born Danish painter Johann Caspar Horner (1774–1834), Swiss physicist and astronomer Johann Friedrich Horner (1831–1886), ophthalmologist