FAI may refer to:
Arts and entertainment Festival de Afrobeat Independiente, an afrobeat festival in Buenos Aires Fai D. Flowright, a fictional character from Tsubasa: Reservoir Chronicle Fai, a character in the anime series Endro!
Organizations Food Allergy Initiative, a former American food allergen research organization FAI Films, a defunct Australian film production company FAI Insurance, former Australian insurance company FAI rent-a-jet, a German airline Fondo per l'Ambiente Italiano, the Italian National Trust, an Italian environmental organization Forschungs- und Arbeitsgemeinschaft Irland e.V., a German society for Irish philately
Politics Broad Left Front (Peru) (Spanish: ), a political coalition in Peru Federación Anarquista Ibérica, the Iberian Anarchist Federation Informal Anarchist Federation (Italian: ), an insurrectionary anarchist organization Italian Anarchist Federation (Italian: )
Sport Fédération Aéronautique Internationale, the world governing body for air sports; it also stewards definitions regarding human spaceflight Football Association of Ireland, the governing body for association football in the Republic of Ireland Futsal Association of India, the governing body of state-level futsal
Science and technology Field-aligned irregularity Feel-status minus actual-status inconsistency index, a measurement used to study body image Femoroacetabular impingement, a hip joint condition First article inspection, a production validation process Free androgen index, a ratio used to determine abnormal androgen status in humans Friendly artificial intelligence Fully Automatic Installation, Linux distribution automation software
People Collins Fai (born 1992), Cameroonian footballer George Fai (born 1996), Australian rugby league footballer Sonny Fai (1988–2009), New Zealand rugby league player
Other uses FAI armoured car, a Soviet military vehicle of the early 1930s Fairbanks International Airport, in Alaska, US Faiwol language (ISO 639-3 code: fai), spoken in Papua New Guinea Fatal accident inquiry, in Scotland