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FJ may refer to:

  • femto joule (fJ), an SI unit of energy equal to 10 joules
  • Fiji ( ISO 3166-1 alpha-2 country code)
    • .fj, the country code top level domain (ccTLD) for Fiji
  • the IATA code for Fiji Airways
  • the racing class Formula Junior
  • the FJ Fury, an early Cold War fighter aircraft of the US Navy
  • the Flying Junior, a sailing dinghy
  • abbreviation and slang for footjob
  • the Toyota FJ Cruiser
  • Holden FJ, an Australian car
  • FJ1100 or FJ1200 Yamaha motorcycle
  • Finger Joint Boards
  • an abbreviation of Fallschirmjäger (German paratroopers)
  • The FASEB Journal
  • Fujian, a province of China