Horn or horns primarily 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 (substance), a colloquial reference to keratin, the substance that, apart from other functions, is the main component of the tissue that sheaths the bony core of horns and hoofs of various animals

Horn or horns may also refer to: