If

If may refer to:

Conditional statement, a computer programming language command
If (island), a small island in the Bay of Marseille, France
- Château d'If, a fortress prison on the island
If (insurance company), in the Nordic countries
Impact Factor, a measure of the importance of scientific journals
Intelligent falling, alternative theory of gravitation
Intelligent Finance, a retail banking operation of the Halifax Bank of Scotland group
Intermediate frequency, an intermediate step in radio transmission or reception
Intermediate filament, a component of the cytoskeleton
Initiation factor, an important component in protein synthesis
Islas Airways IATA airline designator

In music:

"If" (Bread song)
"If (They Made Me a King)", a song originally written in 1934 and popularized in 1951 by Perry Como
"If" (Pink Floyd song)
"If" (The Cult song)
"If" (Janet Jackson song)
IF (band), 1970's British progressive rock band

In other entertainment:

If... (film), a 1968 British film
If... (comic), a political comic strip which appears in the UK newspaper The Guardian
If... (TV series), a series of BBC drama-documentaries
If—, Rudyard Kipling poem, If you can keep your head when all about you...
If (magazine), subtitled "Worlds of Science Fiction", launched in 1952
Interactive fiction, computer text adventure games
The International Fleet, the fictional space defense force of Earth in the Orson Scott Card novel Ender's Game

See also