FA, Fa or fa may refer to:
People Fa of Xia, King of China 1747–1728 BC Fa Ngum (1316–1393), founder and ruler of the Lao kingdom of Lan Xang Fa Ziying (1964–1999), Chinese serial killer
Places Fa, Aude, a commune of the Aude in France Friends Academy, Locust Valley, New York, US
Arts and entertainment Fa (musical note) Fa Yuiry, a fictional character in Mobile Suit Zeta Gundam Fantasy Advertiser, later FA, UK fanzine Firearms (video game), 1998 Fur Affinity, a furry fandom-centric art community website
Government, law and politics Fa (philosophy), a Chinese concept Falange Auténtica, a Spanish political party Finance Act Fisheries Agency, Taiwan
Languages and alphabets Fa (letter) of the Arabic abjad Faʼ language, Bantu language of Cameroon fa, ISO 639-1 code of the Persian language
Mathematics, science, and technology Factor analysis, a statistical method Fanconi anemia, a genetic disease Fayalite, an olivine mineral Femtoampere (fA) Fluorescein angiography, for eye examination Folic acid, a B vitamin Fractional anisotropy, degree of anisotropy Friedreich's ataxia, a genetic disease Nikon FA, a camera
Military Fedorov Avtomat, Russian one of the world's first operational automatic rifles Forschungsamt, Nazi German intelligence agency Frontal Aviation, Soviet Air Forces battlefield air defence Fleet Admiral, usually the highest rank of naval officers
Sport The Football Association, regulatory body, England First ascent, of a mountain Football association, a governing body for association football
Transport ALCO FA, a US locomotive Toyota FA, a truck Area forecast, in aviation Ferrocarriles Argentinos, Argentine railways Safair, a South African airline, IATA code NZR FA Class, New Zealand locomotive class
Other uses Faculty of Arts or Intermediate of Arts, a high school diploma Fa (brand), of personal care products fa’ or Fall (unit), obsolete Scottish length unit Food Addicts in Recovery Anonymous (FA) Fa, a note in Solfège