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
• Interactive fiction, text-based computer games featuring interactive stories and environments
• 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

• If and only if, iff, indicating necessary and sufficient conditions
• IFF

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