# If

If or IF may refer to:
* If (preposition), a preposition used in English conditional sentences
* If (subordinator), a subordinator used for English subordinate interrogative clauses

## Arts and entertainment
### Film and television

* If.... (1968), a Lindsay Anderson film starring Malcolm McDowell
* IF (film), a 2024 fantasy film about imaginary friends
* If... (TV series), a series of BBC drama-documentaries
* "If..." (Desperate Housewives), a 2010 episode of Desperate Housewives

### Gaming

* IF, a character in the Hyperdimension Neptunia game series
* Interactive fiction, text-based computer games featuring interactive stories and environments
* Shin Megami Tensei If..., a 1994 video game in the Shin Megami Tensei series
* Kill la Kill the Game: IF, a 2019 video game based on the Kill la Kill anime

### Literature

* If (magazine), subtitled "Worlds of Science Fiction"
* IF Magazine, Inside Film, Australian magazine
* If... (comic), a political comic strip which appears in the UK newspaper The Guardian
* "If—" (published 1910), a poem by Rudyard Kipling
* The laconic phrase "If", a Spartan reply to a threat by Philip II

### Music

* If (band), 1970s British progressive jazz-rock band
* In Flames, a melodic death metal band from Sweden, and a song from their album Lunar Strain
* I-F, stage name of Ferenc E. van der Sluijs, a Dutch producer and DJ

#### Albums

* If (Glass Hammer album), 2010 album by American band Glass Hammer
* If (If album), 1970 album by the English band If
* if (Mindless Self Indulgence album), a 2008 album recorded by Mindless Self Indulgence
* (if), a 2009 album by Diary of Dreams
* If..., a 2011 orchestral concept album by Bill Ryder-Jones
* ‘’If…’’, a 1992 album by English band Scorpio Rising

#### Songs

* "If..." (The Bluetones song), 1998
* "If" (Bread song), 1971, covered by many artists, including a UK #1 by Telly Savalas in 1975
* "If" (French Kiss song), 2011
* "If" (Glasvegas song), 2013
* "If" (Janet Jackson song), 1993
* "If" (Kana Nishino song), 2010
* "If" (Pink Floyd song), 1970
* "If (Mata Aetara)", by Day6, 2018
* "If (They Made Me a King)", written by Tolchard Evans, Robert Hargreaves and Stanley J. Damerell, 1934; notably recorded by Perry Como, 1950
* "If", by Jeri Lynne Fraser (as Jeri Lynn), 1959
* "If", by Femme Fatale from Femme Fatale, 1988
* "If", by The Cult from Ceremony, 1991
* "If", by Joe Satriani from his 1995 self-titled album
* "If...", by The Divine Comedy from A Short Album About Love, 1997
* "If", by Bananarama from Exotica, 2001
* "If", by Destiny's Child from Destiny Fulfilled, 2004
* "If", by Red Hot Chili Peppers from Stadium Arcadium, 2006
* "If", by Freemasons from Unmixed, 2007
* "If", by Joni Mitchell from Shine, 2007
* "If", by Davido, 2017
* "If", by R5 from New Addictions, 2017

## Business and organizations

* If (insurance company), in the Nordic countries
* IF Metall, a trade union in Sweden
* Illuminati Films, an Indian motion picture production, based in Mumbai
* Independent Fabrication, a bicycle manufacturer
* Intelligent Finance, a bank
* Interflug (1958–1991; IATA airline designator IF)
* International Federation, any of several world sport governing bodies
* International Forum Design (iF), a society best known for its iF design awards
* Islamic Front (Syria), Sunni Islamist rebel group involved in the Syrian Civil War
* Islas Airways (founded 2002; IATA airline designator IF)

## Science and technology
### Biology and medicine

* I$_f$ current, a component current in the cardiac pacemaker potential
* Immunofluorescence, a form of labeling substances with fluorescent antibodies
* Initiation factor, an important component in protein synthesis
* Intermediate filament, a component of the cytoskeleton
* Interstitial fluid, the liquid outside of a cell
* Intrinsic factor, produced by the stomach

### Computing and mathematics

* If-then-else, a conditional statement in computer programming
* IF (x86 flag), the Interrupt Flag in the x86 processor architecture
* Information filter, or inverse covariance filter, in Kalman filtering
* Interface (computing), a shared boundary across which components of a computer system exchange information
* Intermediate form, a type of data structure in computer programming

### Other uses in science and technology

* Information filtering system, which removes redundant or unwanted information at a semantic level
* Intelligent falling, a satirical "alternative theory" of gravitation
* Intermediate frequency, in radio transmission or reception
* Internal focusing, a lens technology in which focusing occurs only with internal elements
* Iodine monofluoride, an unstable interhalogen inorganic compound
* International Fujita scale (IF-scale), a scale to rate a tornado's intensity

## Other uses

* If, a small island in the Bay of Marseille, France; location of the Château d'If
* If, a prominent example of a laconic phrase
* Impact factor, a measure reflecting the average number of citations to articles published in scholarly journals
* Intellectual freedom, a right to access, explore, consider, and express ideas and information
* Intermittent fasting, a diet having recurring periods of fasting
* Internally Flawless, a grade of diamond clarity
* Inside forward, a position in association football
* Ilfov County (except Bucharest), on the vehicle registration plates of Romania