FS

FS, fS or fs may refer to:

Arts and entertainment

 * FS (musician) (real name Fred Sargolini), American dubstep producer and DJ from New York
 * 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

 * 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
 * Fortune Systems, a defunct American computer manufacturer
 * Farmers' and Settlers' Association of New South Wales (F & S), Australia

Transportation

 * Ferrocarril de Sóller, a railway on Majorca
 * Ferrovie dello Stato, 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 $$f_s$$), 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)