FA or fa may stand for:

• Finite automata
• Area forecast (aviation)
• Certified mail (Scott catalog prefix)
• Fa , a commune of the Aude département in France
• Factor analysis
• Faculty assistant
• Falkland Islands (FIPS country code)
• Fame Academy
• Family assistance
• Fanconi anemia
• Farm Aid
• Farmer's Almanac
• Fat admirer
• Fatty acid
• Feasibility analysis
• Featured article on Wikipedia
• Federal agent
• Felonious assault
• Fenton's Approximation
• Fibonacci Association
• Field artillery
• Fiery Avenger
• Filiae Amatissimae (Lat. "To My Beloved Daughter")
• Final approach (aviation)
• Final art
• Finanzamt (Germany)
• Fine arts
• Firearms HL
• First aid
• First ascent (climbing)
• Fixed assets
• Flight attendant
• Fluorescein angiogramic angiography
• Fluorescent antibody
• For Auction
• Football Association (England)
• Frankford Arsenal
• Fredericksburg Academy
• Friederich's Ataxia
• Functional assessment
• Fuck all (used in the expression Sweet FA, which originally stood for Sweet Fanny Adams)
• Nikon FA 35mm SLR camera
• Persian language (ISO 639 alpha-2, fa) from Persian Farsi