F3

F3 or F03 may refer to:

Computing

 * F3, a function key on a computer keyboard
 * F3 (language), the working name for JavaFX Script, a scripting language
 * Fat-Free Framework, a PHP web application framework

Military

 * Douglas F-3 Havoc, a photographic reconnaissance plane
 * Douglas F3D Skyknight (later F-10 Skyknight), a Douglas twin engine, mid-wing jet fighter
 * F 3 Malmslätt, a former Swedish Air Force unit
 * Felixstowe F.3, a 1917 British First World War flying boat
 * Hannover F.3, a World War I German prototype escort fighter
 * HMS Cossack (F03), a 1937 British Royal Navy destroyer
 * HMS F3, a British F class submarine
 * McDonnell F3H Demon (later F-3 Demon), a United States Navy carrier-based jet fighter
 * Mk F3 155mm, French self-propelled gun
 * RAF Tornado F3, a British fighter
 * USS F-3 (SS-22), a United States Navy submarine
 * A future Japanese fighter jet (F-3 or F-X) based on the i3 conceptual jet fighter and Mitsubishi X-2 prototype

Transportation

 * BYD F3, an automobile
 * EMD F3, a North American cab-style diesel locomotive introduced in 1945
 * F3 (Istanbul Metro), a funicular railway line in Istanbul, Turkey
 * F3 class, project name for the mega-cruise ship Norwegian Epic
 * Faso Airways IATA airline designator
 * Fokker F.III, a 1921 Dutch single-engine high-winged monoplane aircraft
 * Hinterhoeller F3, a yacht design by Canadian boat builder Hinterhoeller Yachts
 * MV Agusta F3 series, an Italian sports motorcycle
 * Spyder F3, a model of the three-wheeled motorcycle BRP Can-Am Spyder Roadster
 * Sydney Ferries' Parramatta River ferry services, known as the F3
 * Pacific Motorway (Sydney–Newcastle), formerly Sydney–Newcastle Freeway and commonly known as F3
 * LNER Class F3, a class of British steam locomotives

Arts

 * F3 (Fisz Emade jako Tworzywo Sztuczne album)
 * F3 (manga) (F³: Frantic, Frustrated & Female), a hentai manga series
 * F3 (film), a 2022 Indian Telugu-language film by Anil Ravipudi, a sequel to F2 (2019)

Other

 * F3 (classification), a wheelchair sport classification
 * F3 (font format), created by Folio, Inc
 * F3 (gene), a protein
 * F3 isoprostane
 * F3 Nation, a network of free peer-led workouts for men in the U.S.
 * Form, fit and function, an engineering term relating to design processes
 * Formula Three, a class of automobile racing
 * Forsmark 3, a unit at Forsmark Nuclear Power Plant, Sweden
 * Motorola Motofone F3, a mobile phone
 * Nikon F3, an SLR camera
 * Taito F3 System, a 1992 arcade system board
 * A tornado intensity rating on the Fujita scale
 * F3, a type of formant in speech science
 * F3, an EEG electrode site according to the 10-20 system
 * F3 Derby, association football rivalry between Central Coast Mariners and Newcastle Jets