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'IV' as the Roman number for four may refer to:

★ ''Led Zeppelin IV'', the fourth album by Led Zeppelin containing the song "Stairway to Heaven"

★ ''IV'' (Cypress Hill album), the fourth album of Cypress Hill

★ ''IV'' (Diamond Rio album), a 1996 album by Diamond Rio

★ ''IV'' (Godsmack album), the fourth album of Godsmack

★ ''IV'' (To/Die/For album), the fourth album of To/Die/For

★ ''IV'' (Veruca Salt album), the fourth album by Veruca Salt

★ ''IV'' (Winger album), an album of Winger

★ ''Toto IV'', the fourth album of the band Toto

★ ''Grand Theft Auto IV, a video game that was referred to simply as ''IV'' by the developers before its release

★ Subdominant scale degree in music
'IV' as an acronym may refer to:

★ Current-voltage in electronics where I=current and V=voltage

★ Côte d'Ivoire, from the NATO country code

★ Immigration voice a non-profit organisation working to alleviate problems faced by legal high-skilled foreign workers in the United States.

★ Implied volatility in financial mathematics

★ Independent verification systems, voting machines

★ Industrievereinigung, Federation of Austrian Industry

★ Initialization vector, a nonsecret binary vector in cryptography

★ Instrumental variable, a statistical analysis method

★ Inter vivos trust, a living trust created during a person's lifetime

★ ''International Viewpoint'', the monthly magazine of the Reunified Fourth International

★ InterVarsity Christian Fellowship, a Christian ministry for college students

★ Intravenous therapy, giving a liquid substances directly into a vein

★ IrfanView, a freeware image viewer

★ Irish Volunteers, a historical organisation from Ireland.

★ Isla Vista, an unincorporated community in Santa Barbara County, California, US