FAI, used as an acronym, may refer to:

  • FAI armoured car, a Soviet military vehicle of the early 1930s
  • FAI Films, a defunct Australian film production company
  • Fairbanks International Airport (IATA code 'FAI'), a public airport near the city of Fairbanks, Alaska, United States
  • Fatal accident inquiry, a Scottish legal aspect, used when a fatal accident has occurred.
  • Federación Anarquista Ibérica, "Iberian Anarchist Federation"
  • Fédération Aéronautique Internationale, "FAI - The World Air Sports Federation"
  • Federazione Anarchica Informale (Informal Anarchist Federation), Italian organization of direct action anarchist factions
  • Federazione Anarchica Italiana (Italian Anarchist Federation), founded in 1945 in Carrara
  • Femoral Acetabular Impingement, a condition affecting the hip joint.
  • Financial Access Initiative, a research consortium
  • First article inspection
  • Fixed asset investment
  • Fondo per l'Ambiente Italiano, "Italian Environment Fund"
  • Football Association of Ireland, for football (soccer) in the Republic of Ireland.
  • Food Allergy Initiative, a US based non-profit organization which funds research and seeks a cure for food allergies
  • Food Animal Initiative, Oxford based, global, sustainable farming research and development organisation
  • Fournisseur d'accès à Internet, French term for Internet service provider, an organization that sells access to the Internet
  • Free Androgen Index
  • Frente Amplio de Izquierda, Broad Left Front, a political coalition in Peru
  • Friendly artificial intelligence
  • Fresh air intake, in HVAC systems, an opening through which outside air is drawn into a building.
  • Fully Automatic Installation, for non-interactive installation of the Debian GNU/Linux operating system

Fai may refer to:

  • Sonny Fai, New Zealand rugby league player
  • Fay D. Flourite (misnamed 'Fai' in some versions), a character from Tsubasa: RESERVoir CHRoNiCLE