FO

Fo or FO may refer to:

Arts and entertainment

 * Fallout (video game), a 1997 video game
 * Fo Fai, a character in the Battle Arena Toshinden video game series
 * Folio (printing), a book size, the page number of books, or sheets with multiple printed pages
 * Foreign Objects (band), a Pennsylvania music group
 * FunOrb, a 2008 Java-based gaming website

Businesses and organisations

 * Airlines of Tasmania (IATA airline designator), airline of Tasmania, Australia
 * Family office, an investing office controlled by a family
 * Felix Airways (IATA airline designator), a regional airline of Yemen
 * Football Outsiders, a website devoted to statistical analysis of the NFL
 * Force Ouvrière, a French trade unions confederation
 * Foreign Office, a department of the United Kingdom government, currently named Foreign, Commonwealth and Development Office
 * Flybondi (IATA airline designator), airline of Argentina

Computing

 * FO (complexity), a complexity class


 * .fo, the country code top level domain (ccTLD) for Faroe Islands


 * Fiber optic
 * XSL Formatting Objects (XSL-FO), a markup language

Other uses in mathematics, science, and technology

 * Fan out (FO), number of loads at the output of a ring oscillator
 * First-order logic, a system of mathematical logic
 * Forsterite, magnesium-rich end-member in the olivine solid solution series
 * Fourier number (Fo) in physics
 * Fuel factor (Fo), used to check the accuracy of an emission measurement system
 * Fuel oil, also called Furnace Oil
 * FO, a subunit of F1FO type ATPase enzyme

Military or aeronautical roles

 * Field officer, a senior army officer
 * First Officer, or co-pilot on an airliner
 * Flying officer, a Royal Air Force rank
 * Forward Observer, a soldier who directs artillery fire

People

 * Dario Fo (1926–2016), Italian playwright and Nobel laureate
 * Fo Porter, a contestant on America's Next Top Model, Cycle 12
 * Fó or Fú (佛、仏), the Chinese name for Buddha
 * Franco-ontarien, referring to a French-speaking citizen of the (largely anglophone) Canadian province of Ontario, Canada

Places

 * Faroe Islands, ISO 3166-1 country code, FO
 * .fo, the country code top level domain (ccTLD) for Faroe Islands
 * Faroese language (language code fo), a North Germanic language
 * Fô Department of the Houet Province of Burkina Faso
 * , the chief town in Fo Department
 * Province of Forlì, Italy
 * Fort Ord, California

Other uses

 * Face Off (disambiguation)
 * Faroese language (language code fo), a North Germanic language
 * Foreign object (disambiguation)
 * Front office, an area where visitors arrive and first encounter a staff at a place of business
 * Fuck off (disambiguation), an English expletive, and various other meanings
 * Furka Oberalp Railway, a Swiss railway
 * Follow-on, a practice of making a team bat multiple innings in a row in cricket