Horn generally refers to:

• Horn (anatomy), is a living, vein and artery filled, stiff, pointed projection of the skin of various animals, as an organ or its material

Horn can also refer to things that are made from, and/or are shaped like, the anatomical object:

• Horn (acoustic), an open-ended tapered sound-guide to match a sound-producing device to the characteristic impedance of free space
  • Horn (instrument), sometimes called a "French horn," a brass musical instrument constructed of coiled tubing
    • The brass and woodwind musicians in a jazz or R&B band are sometimes referred to collectively as the horn section; "horn" can be a slang reference to any of those instruments
  • A horn speaker incorporates this principle into a loudspeaker
  • Alerting/alarm devices
    • A common example is a car horn; see also Klaxon
    • A railway Train whistle.
    • Foghorn
• Drinking horn, an ancient drinking vessel
• Anointing horn, used for the unction at a coronation
• Horn (telecommunications), an open-ended radio waveguide of increasing cross-sectional area
• Horn (telescope), a stationary radio telescope
• Horn Antenna, constructed, to support Project Echo, and used in the discovery of Cosmic microwave background radiation
• Horn, a smoking pipe shaped like a bull's horn or as a bent cone (as known from 'Sherlock Holmes')
• Horn (Chinese constellation), a constellation in Chinese astronomy
• Glacial horn, a sharp mountain peak created by glacial erosion
• Horn (diacritic), a diacritic mark used to indicate that a normally rounded vowel such as o or u is to be pronounced unrounded
• Horn of Plenty
• Horn-rimmed

Related slang usages include:

• "Horn" is military jargon for a telephone
• "Horns" is a shortened version of "Longhorns", the name of the sports teams of the University of Texas
  • Hook 'em Horns is a hand gesture expressing support for the above teams
• Devil horns is a hand gesture with a vulgar meaning in Mediterranean countries, also used in heavy metal.
• "Horned" and variants can mean cuckolded.
• In Baseball, a Horn is when a player strikes out six times in one game.

Horn can refer to one of the following places:

• Horn of Africa, Somalia, Ethiopia, Eritrea and Djibouti
• Horn, Austria and the surrounding Horn district
• Horn (Germany)
• Horn (Netherlands), a village in the municipality of Haelen
  • Horne (county), a small historic countship of the Holy Roman Empire associated with the village, which was merged into the Prince-Bishopric of Liège
• Horn, Rutland, a small civil parish in England
• Horn, Sweden
• Horn, Switzerland
• Cape Horn, the southernmost point of South America

Horn is also a surname: see Horn (surname).

Horn in fiction and mythology:

• Gjallarhorn, the sounding horn of the god Heimdall and the drinking horn of Mímir, both from Norse mythology.
• Hörn, another name for the goddess Freyja in Norse mythology.
• King Horn, a 13th century Middle English romance story.
• The Horn of Gondor carried by Boromir in the Lord Of The Rings.

Horn may refer to a company:

• The Horn Book is a publisher of journals in the field of children’s and young adults' literature
• HORN is a sales force consulting firm
• HORN or H.O.R.N. is an abbreviation for the Head On Radio Network

Unsorted

• Hoorn
• Horn clause, a term in formal logic
• Horne
• Horny
• Around the Horn

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