FX may refer to:

• FX (TV network), a cable/satellite television network
• FX (UK), a television channel in the United Kingdom, Ireland and Portugal.
• FX (Italy), a television channel in Italy.
• F/X, a movie set in the behind-the-scenes world of special effects
• F/X: The Series, a television program based on the movie
• Athlon 64 FX, a hardware enthusiast variant of the AMD Athlon 64 microprocessor
• Infiniti FX, model designation for Infiniti's compact luxury Crossover Utility Vehicles
• Strictly FX, a special effects company
• Toyota Kijang or Tamaraw FX, a sport utility vehicle
• WinFX: Codename of Microsoft .NET Framework 3.0
• "FX", a song by Black Sabbath on the album Black Sabbath, Vol. 4
• FX format, Nikon's nomenclature for the full-frame digital SLR
• FX, a comic published by IDW, drawn by artist John Byrne
• SBO FX, an electric guitar from SBO Custom Guitars

FX may stand for:

• "effects", as in Special effects, Sound effects and Guitar effects
• Bone fracture, in medical short-hand
• FedEx Express, IATA airline designator
• Fighter Experimental, a 1960s U.S. Air Force advanced fighter specification which yielded the F-15 Eagle Air superiority fighter and largely mirrored in the F-14 Tomcat naval air superiority fighter
• Foresight Exchange, an online prediction market using play money
• Foreign exchange market, a banking term for changing money from one currency into another
• Foreign exchange service (telecommunications), a telephone connection to a distant exchange
• Francis Xavier, a Basque saint and co-founder of the Jesuits
• Mozilla Firefox, a web browser (also abbreviated FF)
• Factor X, a protein involved in coagulation