IV may refer to:

Businesses and organizations

In the United States

Immigration Voice Immigration Voice is a 501(c)(4) nonprofit organization advocating to alleviate problems faced by high-skilled immigrant workers in the United States, through the legislative branch of congress. History Immigration Voice is a 501(c)(4) Nonpro ...

, 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 Ivory Coast, also known as Côte d'Ivoire and officially the Republic of Côte d'Ivoire, is a country on the southern coast of West Africa. Its capital city of Yamoussoukro is located in the centre of the country, while its largest List of ci ...

, a country in West Africa *

IV postcode area 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 Aus ...

, north Scotland * Isla Vista, California, United States

In science, technology and mathematics

Intravenous therapy Intravenous therapy (abbreviated as IV therapy) is a medical technique that administers fluids, medications and nutrients directly into a person's vein. The intravenous route of administration is commonly used for rehydration or to provide nutr ...

, 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