FSA
- FC FSA Voronezh
- FSA Corporation
- Family Support Administration
- Farm Security Administration
- Farm Service Agency
- Fast statistical alignment
- Federal Security Agency
- Federal Student Aid
- Federation of South Arabia
- Federation of Sports Arenas
- Fellow of the Society of Actuaries
- Fellow of the Society of Antiquaries of London
- Fellow of the Society of Antiquaries of Scotland
- Financial Security Assurance
- Financial Services Act (disambiguation)
- Financial Services Agency
- Financial Services Authority
- Financial Services Authority (Isle of Man)
- Financial Supervisory Authority (Sweden)
- Financial statement analysis
- Finite-state automaton
- Fire Services Act (disambiguation)
- Flexible spending account
- Flint Southwestern Academy
- Florida Sheriffs Association
- Florida Student Association
- Flying Saucer Attack
- Food Science Australia
- Food Standards Agency
- Football South Australia
- Football Supporters' Association
- Foreign Service Academy
- Forward Sortation Area
- Forward scattering alignment
- Fran Silvestre Arquitectos
- Free Spirit Alliance
- Free Syrian Army
- Freedom Support Act
- Salvadorian Athletics Federation
- Saxony-Anhalt Football Association
- Syrian National Army