If

If is a very common English word used in the protasis of a conditional sentence and the antecedent of a proposition. It is often used in computer languages to indicate a conditional.

If is also
* If (island), a small island in the Bay of Marseille, France
* If (band), 1970s British progressive jazz-rock band
* "If" (magazine), subtitled "Worlds of Science Fiction"
* If (song), any of several songs
* if, an album recorded by Mindless Self Indulgence

When followed by various forms of punctuation, If can refer to:
* "If—", the Rudyard Kipling poem
* If?, a dance band of the late 1980s and early '90s
* "If... (comic)", a political comic strip which appears in the UK newspaper "The Guardian"
* "If... (TV series)", a series of BBC drama-documentaries
* "if....", a 1968 Lindsay Anderson film starring Malcolm McDowell
* "Shin Megami Tensei if...", a 1994 video game in the Shin Megami Tensei series for the Super Famicom

As an abbreviation, IF can refer to
* IF (x86 flag), the Interrupt Flag in the x86 architecture
* Immunofluorescence, a form of labeling substances with radioactive antibodies
* Impact Factor, a measure of the importance of scientific journals
* In Flames, a melodic death metal band from Sweden
* Initiation factor, an important component in protein synthesis
* Intelligent falling, alternative theory of gravitation
* Interactive fiction, text-based computer games featuring interactive stories and environments
* Intermediate filament, a component of the cytoskeleton
* Intermediate frequency, an intermediate step in radio transmission or reception
* Internal focusing, a lens technology in which focusing occurs only with internal elements
* Interstitial fluid, the liquid outside of a cell

Businesses named "If" or abbreviated "IF" include:
* If (insurance company), in the Nordic countries
* IF? Records, a Tokyo-based electronic music label
* Intelligent Finance, a bank
* International Forum Design (iF), a society best-known for its iF design awards
* InvisionFree, an Internet service provider
* Islas Airways (IF is its IATA airline designator)
* Independent Fabrication, a bicycle manufacturer

In Computer Programming
* If-then-else Statement

ee also

*If and only if, "iff", indicating necessary and sufficient conditions
*IFF
*IFS (disambiguation)
*lookfrom|If