Horn most often refers to:

  • Horn (acoustic), a conical or bell shaped aperture used to guide sound
  • Horn (anatomy), a pointed, bony projection on the head of various animals, either the "true" horn, or other horn-like growths
    • Horn, a colloquial reference to keratin, the substance that is the main component of the tissue that sheaths the bony core of horns and hoofs of various animals

Horn may also refer to: