If

If is a conjunction that can introduce a conditional clause. If may also refer to:

Music

If (They Made Me a King), a 1951 hit song by Perry Como.
If (band), 1970s British progressive jazz-rock band
If (If album)
If?, a dance band of the late 1980s and early '90s
"If", a song by Bananarama, released in 2001
"If..." (The Bluetones song), released in 1998
"If" (Bread song), originally released in 1971 and a number one UK single by Telly Savalas in 1975
"If", a song by The Cult from the album Ceremony
"If...", released in 1997 by The Divine Comedy from the album A Short Album About Love
"If" (Freemasons song), released in 2009
"If" (Janet Jackson song), released in 1993
if (Mindless Self Indulgence album), a 2008 album recorded by Mindless Self Indulgence
"If" (Pink Floyd song), released in 1970
"If" (Red Hot Chili Peppers song), released in 2006

If... (comic), a political comic strip which appears in the UK newspaper The Guardian
if...., a 1968 Lindsay Anderson film starring Malcolm McDowell
If (magazine), subtitled "Worlds of Science Fiction"
"If—", the Rudyard Kipling poem
If... (TV series), a series of BBC drama-documentaries
"If..." (Desperate Housewives), a 2010 episode from the 6th season of Desperate Housewives
Shin Megami Tensei if..., a 1994 video game in the Shin Megami Tensei series for the Super Famicom

If, a small island in the Bay of Marseille, France, location of the Chateau d'If known for having inspirated french writer Alexandre Dumas in his novel The Count of Monte Cristo

The I_f current, a component current in the cardiac pacemaker potential
IF (x86 flag), the Interrupt Flag in the x86 architecture
Immunofluorescence, a form of labeling substances with fluorescent antibodies
Impact factor, a measure reflecting the average number of citations to articles published in scholarly journals
In Flames, a melodic death metal band from Sweden as well as a song from their album Lunar Strain
Initiation factor, an important component in protein synthesis
Intelligent falling, an alternative theory of gravitation
Interactive fiction, text-based computer games featuring interactive stories and environments
Interface, in Linux commands like ifup, ifdown and POSIX standards headers like if.h
Intermediate filament, a component of the cytoskeleton
Intermediate form, a data structure constructed from the input to a computer program from which the output is constructed
Intermediate frequency, an intermediate step in radio transmission or reception
Intermittent fasting, a diet having recurring periods of fasting
Internal focusing, a lens technology in which focusing occurs only with internal elements
Internally Flawless, a grade of diamond clarity
Interstitial fluid, the liquid outside of a cell
Iodine monofluoride, unstable interhalogen inorganic compound
InvisionFree, a free online forum hosting service