IV may refer to:

Businesses and organizations

* Immigration Voice, an activist organization *Industrievereinigung,

Federation of Austrian Industry The Federation of Austrian Industries ( de: ''Industriellenvereinigung'', short form IV) is the voluntary and independent representation of interests of Austrian industry and its related sectors. The IV maintains a wide net of contacts and relation ...

Intellectual Ventures Intellectual Ventures is an American private equity company that centers on the development and licensing of intellectual property. Intellectual Ventures is one of the top-five owners of U.S. patents, as of 2011. Its business model focuses on ...

, a privately held intellectual property company *

InterVarsity Christian Fellowship InterVarsity Christian Fellowship/USA is an inter-denominational, evangelical Christian campus ministry founded in 1941, working with students and faculty on U.S. college and university campuses. InterVarsity is a charter member of the Internat ...

Irish Volunteers The Irish Volunteers ( ga, Óglaigh na hÉireann), sometimes called the Irish Volunteer Force or Irish Volunteer Army, was a military organisation established in 1913 by Irish nationalists and republicans. It was ostensibly formed in respon ...

, a military organization *

Italia Viva Italia Viva (, IV) is a liberal political party in Italy founded in September 2019. The party is led by Matteo Renzi, a former Prime Minister of Italy and former secretary of the Democratic Party (PD). History Background Matteo Renzi sta ...

, an Italian centrist political party, led by former prime minister Matteo Renzi

Music

* Subdominant, in music theory

Recordings

* ''IV'' (The 1975 EP), 2013 * ''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'' (The Lookouts album), 1990 * ''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 * "I.V." (X Japan song), an X Japan song, 2008 * ''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 ''Toto IV'' is the fourth studio album by American rock band Toto released in the spring of 1982 by Columbia Records. The lead single, " Rosanna", peaked at number 2 for five weeks on the ''Billboard'' Hot 100 charts, while the album's third s ...

'', 1982

Places

* Ivory Coast, a country *

IV postcode area The IV postcode area, also known as the Inverness postcode area, is a group of 52 postcode districts for post towns: Achnasheen, Alness, Avoch, Beauly, Bonar Bridge, Cromarty, Dingwall, Dornoch, Elgin, Moray, Elgin, Fochabers, Forres, Fortrose, ...

, the Inverness postcode area in the UK *

Isla Vista Isla Vista is an unincorporated community and census-designated place (CDP) in Santa Barbara County, California in the United States. As of 2020 census, the community had a population of 15,500. The majority of residents are college students at t ...

, an unincorporated community in the United States near Santa Barbara, California

In science and technology

* Intravenous therapy, a route of administration of a drug * I–V curve, current–voltage curve characteristic *

Implied volatility In financial mathematics, the implied volatility (IV) of an option contract is that value of the volatility of the underlying instrument which, when input in an option pricing model (such as Black–Scholes), will return a theoretical value equ ...

, a term in financial mathematics * Independent variable, in mathematical and statistical modeling * Independent verification systems, in voting machines *

Initialization vector In cryptography, an initialization vector (IV) or starting variable (SV) is an input to a cryptographic primitive being used to provide the initial state. The IV is typically required to be random or pseudorandom, but sometimes an IV only needs to ...

, in cryptography *

Instrumental variable In statistics, econometrics, epidemiology and related disciplines, the method of instrumental variables (IV) is used to estimate causal relationships when controlled experiments are not feasible or when a treatment is not successfully delivered t ...

, in statistics * Intrinsic value (finance), of an option or stock *

Intrinsic viscosity Intrinsic viscosity \left \eta \right/math> is a measure of a solute's contribution to the viscosity \eta of a solution. It should not be confused with inherent viscosity, which is the ratio of the natural logarithm of the relative viscosity to th ...

Trochlear nerve The trochlear nerve (), ( lit. ''pulley-like'' nerve) also known as the fourth cranial nerve, cranial nerve IV, or CN IV, is a cranial nerve that innervates just one muscle: the superior oblique muscle of the eye, which operates through the pu ...

, the fourth cranial nerve

Other uses

* 4 (number) in Roman numerals *''

International Viewpoint ''International Viewpoint'' is the English-language online magazine of the Trotskyist reunified Fourth International. It focuses on publishing articles on the political and social situation throughout the world, notably by translating articles in ...

'', an online magazine of the Trotskyist reunified Fourth International *

Inter vivos trust A trust is a legal relationship in which the holder of a right gives it to another person or entity who must keep and use it solely for another's benefit. In the Anglo-American common law, the party who entrusts the right is known as the "settl ...