Fos

FOS or Fos may refer to:

Arts and entertainment

 * Fos (EP), by Elena Paparizou
 * Fortress of Solitude, fictional base of Superman

Food

 * French onion soup, a dish
 * Fructooligosaccharide, a sweetener

Government, law and military

 * Financial Ombudsman Service, in the United Kingdom
 * Financial Ombudsman Service (Australia)
 * Forward Operating Site, in the U.S. military
 * Freedom of speech, a human right
 * Future Office System, Scottish prosecutors' case system

People

 * Fos Williams (1922–2001), Australian-rules footballer
 * Peter J. Fos (born 1949), American academic administrator

Places

 * Fos, Haute-Garonne, France
 * Fos, Hérault, France
 * Fos-sur-Mer, Bouches-du-Rhône, France
 * Marseille-Fos Port, France
 * Forrest Airport, Western Australian refuelling airfield, IATA code FOS
 * French Overseas Territories, UNDP country code, see Overseas territory (France)

Science and technology

 * Fabric OS, in networking
 * Factor of safety, in engineering
 * Feature-oriented scanning, in microscopy
 * Faint Object Spectrograph, on the Hubble Space Telescope
 * Fields of Science and Technology, a classification for academic statistics
 * Flowers of sulfur
 * Flowers of sulfur tests

Molecular biology
FOS-family transcription factors:
 * c-Fos, a proto-oncogene
 * FosB, a proto-oncogene
 * ΔFosB, a truncated splice variant of FosB
 * FOSL1, Fos-related antigen 1
 * FOSL2, Fos-related antigen 2

Other uses

 * Florida Ornithological Society, United States
 * FOS Open Scouting, a Belgian youth organisation
 * Goodwood Festival of Speed, an English hill-climbing event