FS, fS or fs may refer to:

Arts and entertainment

  • FS (musician) (real name Fred Sargolini), American dubstep producer and DJ from New York
  • Florin Salam, Romanian manele musician often called by his initials FS
  • FS Catalogue, a numbered list of all compositions by Carl Nielsen
  • FS Film, a Finnish film distributor
  • Flight simulator, a professional simulator of planes
  • Flight simulation video game, a video game version of simulators
  • Microsoft Flight Simulator, an amateur flight simulator series
  • Microsoft Flight Simulator X (FSX), the 2006 edition
  • Microsoft Flight Simulator (2020 video game) (FS), the 2020 edition
  • Fox Sports (United States), the sports programming division of Fox Corporation
  • Fox Sports 1 (FS1)
  • Fox Sports 2 (FS2)

Businesses and organizations

  • Fagoppositionens Sammenslutning, a Danish trade union federation
  • FamilySearch, a genealogical organization and website
  • Farmers' and Settlers' Association of New South Wales (F & S), Australia
  • Fortune Systems, a defunct American computer manufacturer
  • Frankfurt School of Finance & Management, a business school in Frankfurt, Germany
  • FS Services, an agricultural supply cooperative, now Growmark
  • Full Sail University, a university in Florida, US
  • Future Shop, a defunct Canadian consumer electronics retailer
  • Federal Signal, a warning systems manufacturer

Transportation

  • Ferrocarril de Sóller, a railway on Majorca
  • Ferrovie dello Stato Italiane, Italian state railways
  • Trenitalia, its subsidiary for operating passenger rail transport
  • First ScotRail, a British rail train operator
  • ItAli Airlines (former IATA code: FS), a former Italian airline (2003–2011)
  • Flyr (airline) (former IATA code: FS), a former Norwegian airline (2020–2023)

Science and technology

  • Feldspar, a group of silicate minerals
  • Fin-stabilized projectile, such as the APFSDS or HEAT-FS
  • Flank speed, a ship's true maximum speed
  • Frameshift mutation, a genetic mutation
  • Fujita scale (F-Scale), or Fujita-Pearson scale, a scale for rating tornado intensity
  • Full scale, in electronics and signal processing, the maximum amplitude a system can present
  • Marine flooding surface, a sharp contact between deep-water and shallow-water facies in sequence stratigraphy
  • Sampling rate (symbol <math>f_s</math>), in communications theory
  • Fourier series, a mathematical tool used for analyzing periodic functions

Computing

  • FS register, in X86fs computer architecture
  • File Separator, a character in the C0 and C1 control codes
  • File server, a form of disk storage
  • File system, in computer science and database theory
  • Flipnote Studio, a DSi animation software
  • Forward secrecy, a property of cryptographic systems
  • Fullscreen, a picture format in 4:3 aspect ratio, as opposed to widescreen
  • IBM Future Systems project a failed IBM project to develop a computer line to replace System/360
  • Feature structure, a set of attribute–value pairs

Medicine

  • Felty's syndrome, autoimmune disease, with rheumatoid arthritis, enlargement of the spleen and too few neutrophils in the blood
  • Fibrin sealant, a type of surgical tissue adhesive used during surgery to control bleeding
  • Flight Surgeon, a physician who is responsible for the medical evaluation, certification and treatment of aviation personnel
  • Fractional shortening, of the heart
  • Formularium Slovenicum, Slovenian addendum to the European Pharmacopoeia

Physics

  • Femtosecond (fs), an SI unit of time
  • Siemens (unit) Femtosiemens, an SI unit of electric conductance
  • Fine structure, in atomic physics

Military

  • Freight and supply ship (FS), a US Army classification for a type of cargo ship
  • Fire support, artillery or close air support for combat operations
  • Flight Sergeant, a non-commissioned officer in some air forces
  • Flight Surgeon, physician primarily responsible for the medical evaluation, certification and treatment of aviation personnel
  • French Ship (FS), a NATO prefix for ships of the French Navy

Sport

  • Free safety, one variation of the defensive back position in American football
  • Free skating, the second part of a figure skating competition
  • Formula Student, a student engineering competition held annually in the UK

Other uses

  • Federal Standard 595, a United States federal standard defining color shades
  • Financial Secretary (Hong Kong)
  • For Sale (disambiguation)
  • Foundation Stage, term used for early childhood education in the UK
  • Franco's Spain, Spain under the leadership of Francisco Franco
  • French Southern Territories (FIPS PUB 10-4 territory code); excludes the Terre Adélie portion of Antarctica
  • Full service (disambiguation)
  • FontStruct, a font-making website

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