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 (Marvelous 3 album), 2023 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 (The 1975 EP), 2013 IV (Lifer EP), 2002 "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 Iodine value, in chemistry 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)