IV may refer to:

Businesses and organizations

In the United States

  • Immigration Voice, an activist organization
  • Intellectual Ventures, a privately held intellectual property company
  • InterVarsity Christian Fellowship

Elsewhere

  • Federation of Austrian Industries ()
  • Irish Volunteers, a military organization
  • Italia Viva, an Italian centrist political party

Music

  • Subdominant, in music theory

Recordings

  • IV (The Aggrolites album), 2009
  • IV (Angband album), 2020
  • IV (BadBadNotGood album), 2016
  • IV (Black Mountain album), 2016
  • IV (Cypress Hill album), 1998
  • IV (Diamond Rio album), 1996
  • IV (Goatsnake album), 1998
  • IV (Godsmack album), 2006
  • IV (Hiroyuki Sawano album), 2021
  • I.V. (Loma Prieta album), 2012
  • IV (Maylene and the Sons of Disaster album), 2011
  • IV (Ton Steine Scherben album), 1981
  • IV (The Stranglers album), 1980
  • IV (To/Die/For album), 2004
  • IV (Veruca Salt album), 2006
  • IV (Winger album), 2006
  • IV (Željko Joksimović album), 2005
  • Faust IV, 1973
  • Good Apollo, I'm Burning Star IV, Volume One: From Fear Through the Eyes of Madness, by Coheed and Cambria, 2005
  • Led Zeppelin IV, 1971
  • Toto IV, 1982
  • IV (EP), a 2013 EP by The 1975
  • "I.V." (song), by X Japan, 2008
  • IV, 1998 album by Siam Shade
  • IV, a 1990 EP by The Lookouts

Places

  • Ivory Coast, a country in West Africa
  • IV postcode area, north Scotland
  • Isla Vista, California, United States

In science, technology and mathematics

  • Intravenous therapy, a route of administration of a drug
  • I–V curve, current–voltage curve characteristic
  • Implied volatility, a term in financial mathematics
  • Independent variable, in mathematical and statistical modeling
  • Independent verification systems, in voting machines
  • Induction variable, in computer science
  • Initialization vector, in cryptography
  • Instrumental variable, in statistics
  • Intrinsic viscosity
  • Trochlear nerve, the fourth cranial nerve

Other uses

  • 4 (number) in Roman numerals
  • Four-Phase Systems, a computer company whose logo was a stylized "IV"
  • International Viewpoint, an online magazine of the Trotskyist reunified Fourth International
  • Inter vivos trust, a legal instrument
  • Coleman Williams, American country music singer known professionally as IV

See also

  • 4 (disambiguation)