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
See also John Horn High School, a secondary school in Mesquite, Texas, United States John Horne (disambiguation)