F4, F.IV, F04, F 4, F.4 or F-4 may refer to: Aircraft Flanders F.4, a 1910s British experimental military two-seat monoplane aircraft Martinsyde F.4 Buzzard, a British World War I fighter version of the Martinsyde Buzzard biplane Fokker F.IV, a 1921 Dutch airliner Caproni Vizzola F.4, an Italian prototype fighter of 1939 Lockheed F-4 Lightning, a reconnaissance variant of the Lockheed P-38 Lightning World War 2 fighter Fleetwings Sea Bird, a variant of which was the F-4 A number of aircraft that first entered service with the U.S. Navy: Curtiss F4C, a 1920s version of the Naval Aircraft Factory TS biplane fighter Boeing F4B, a 1930s version of the Boeing P-12 biplane fighter Grumman F4F Wildcat, a carrier-based fighter aircraft in World War 2 Vought F4U Corsair, a World War 2 fighter Douglas F4D Skyray, a carrier-based fighter/interceptor, first flight 1951 McDonnell Douglas F-4 Phantom II, a supersonic fighter-bomber, first flight 1958 Art, entertainment, and music F4, or Flower 4, the four handsome boys appearing in Japanese manga Boys Over Flowers F4 (band), Taiwanese boy band F4 Thailand, a Thai television series F4, Middle F (musical note) Fantastic Four, fictional superhero team Computing and technology Faugère's F4 algorithm in computer algebra F4, a function key on a computer keyboard f4transkript, a transcription software Samsung Galaxy F04, an Android-based smartphone manufactured by Samsung Electronics Mathematics F4 (mathematics), the name of a Lie group and also its Lie algebra f4 F4, Fermat number Sports and games F4 (classification), a wheelchair sport classification Formula 4, a class of car racing f4, designates a square in Algebraic notation (chess) 1. f4, or Bird's opening, an opening move in chess Transportation and vehicles F4 (Istanbul Metro), a funicular railway in Istanbul Turkey F4 Cross Harbour, or Cross Harbour ferry services, Sydney, Australia Albarka Air (IATA code), a Nigerian airline Front-engine, four-wheel-drive layout, in automotive design MV Agusta F4 series, a series of motorcycles Saginaw Airport (FAA identifier F04), a defunct public airport in Fort Worth, Texas, U.S. USS F-4, a U.S. Navy submarine that sank near Honolulu harbor in 1915 LNER Class F4, a class of British steam locomotives Other uses F4, a paper size F 4 Frösön, a former Swedish Air Force wing f/4, an f-number of an optical system such as a camera lens F-4 Object, or Rákosi bunker, a formerly secret nuclear shelter in Budapest, Hungary Form F-4, an American form used