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), an exceptional Lie group, or its Lie algebra , the field with four elements 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 Cross Harbour ferry service, or Cross Harbour ferry services (2017–2020), Sydney, Australia Pyrmont Bay ferry service, or Pyrmont Bay ferry services, Sydney, Australia Albarka Air (IATA code), a Nigerian airline Front-engine, four-wheel-drive layout, in automotive design , an Italian Regia Marina (Royal Navy) submarine in commission from 1917 to 1919 MV Agusta F4 series, a series of motorcycles 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 to register securities Nikon F4, an SLR camera F4, a tornado intensity rating on the Fujita scale F4, an electrode site according to the 10–20 system (EEG) F4 visa, a visa used for Korean adoptees to gain South Korean citizenship
See also 4F (disambiguation) Four Fs (disambiguation)