Alexander Horn (disambiguation)

Alexander Horn may refer to:
 * Alexander Horn (1762–1820), secret agent monk
 * Alex Horn (1929–2007), cult leader, playwright and actor
 * Alexander horn aka Alex horn, musical instrument
 * Alexander horned sphere, mathematical concept
 * Alexander Horne, Governor of the Isle of Man 1713–1723
 * Alex Horne (born 1978), British comedian
 * Horns of Alexander, a mythological motif associated with Alexander the Great