FA or fa may stand for:
- Area forecast (aviation)
- Certified mail (Scott catalog prefix)
- Fa, a municipality in France
- Factor analysis
- Faculty assistant
- Falkland Islands (FIPS country code)
- Fame Academy
- Family assistance
- Fanconi anemia
- Farm Aid
- Farmer's Almanac
- Fatty acid
- Feasibility analysis
- 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
- 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)