F3, F03, F.III, F.3, F 3 or F-3 may refer to:

• F3 class, a project name for an upcoming class of Norwegian Cruise Lines mega-cruise ships
• F-3 Demon, a carrier based jet fighter of the United States Navy
• F3 (font format), created by Folio, Inc.
• F3 (language), the working name for JavaFX Script, a scripting language
• F 3 Malmslätt, a former Swedish Air Force unit
• F3 (Zimbabwe), a road in Zimbabwe
• EMD F3, a North American cab-style diesel locomotive introduced in 1945
• Felixstowe F.3, a 1917 British First World War flying boat
• Fokker F.III, a 1921 Dutch single-engined high-winged monoplane aircraft
• Forsmark 3, unit 3 at Forsmark Nuclear Power Plant, Sweden
• Hannover F.3, a World War I German prototype escort fighter
• HMS F3, a British F class submarine
• HMS Cossack (F03), a 1937 British Royal Navy Tribal-class destroyer
• Motorola Motofone F3, a mobile phone
• Nikon F3, a professional SLR camera
• RAF Tornado F3
• PRR F3, an American PRR 2-6-0 steam locomotive
• Taito F3 System
• USS F-3 (SS-22), F-class submarine of the United States Navy

F³ may refer to:

• F³ (Frantic, Frustrated and Female), a hentai anime series

and also :

• F3D Skyknight (later F-10 Skyknight), a Douglas twin engine, mid-wing jet fighter
• a function key to which can be assigned various purposes depending on the operating system or application in use
• Fallout 3, a successor of Fallout series
• Form, fit and function, an engineering term relating to design processes
• Formula Three racing
• the former designation of the Sydney-Newcastle Freeway
• Faso Airways IATA airline designator
• a tornado intensity rating on the Fujita scale, suggesting a strong tornado
• F03 : Unspecified dementia ICD-10 code

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