Horn or horns primarily refers to:

Horn (acoustic), a conical or bell shaped aperture used to guide sound
Horn (instrument), collective name for tube-shaped wind musical instruments
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: