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 (German: Industrievereinigung)
 - 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
 - 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
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