John Horn

John Horn may refer to:

*John A. Horn (born 1968), former United States Attorney
 * John Galbraith Horn (1860–1925), British tennis player
 * John J. Horn (1917–1999), American labor leader and politician from New Jersey
 * John L. Horn (1928–2006), American psychologist
 * John Horn (tennis) (1931–2001), British tennis player
 * John Horn Jr. (1843–1920), awarded a Congressional Gold Medal in 1874 for a career rescuing people from drowning
 * Steve Horn (John Stephen Horn, 1931–2011), American politician from California