• Steve Horn, John Stephen Horn (born 1931), former Republican congressman from California
• John L. Horn
  John L. Horn
  John L. Horn was a scholar, cognitive psychologist and a pioneer in developing theories of multiple intelligence. Dr. Horn, together with Raymond Cattell, developed the crystallized and fluid theory of intelligence. This theory was later combined with the work of John Carroll and called the CHC...
  
  , psychologist
• John Horn (tennis), British former tennis player of the 1950s

See also

• John Horn High School
  John Horn High School
  Dr. John D. Horn High School is a secondary school in Mesquite, Texas, United States. The school serves the southern portion of Mesquite and the Mesquite ISD portion of Seagoville....
  
  , a secondary school in Mesquite, Texas, United States
• John Horne (disambiguation)
  John Horne (disambiguation)
  John Horne is a geologist.John Horne is also the name of:*John Horne , botanist*John Horne...