FST
- Family Survival Trust
- Feature Selection Toolbox
- Fenchurch Street railway station
- Fermanagh and South Tyrone (Assembly constituency)
- Fermanagh and South Tyrone (UK Parliament constituency)
- Field sobriety testing
- Fiji Standard Time
- File Streaming Technology
- Financial Secretary to the Treasury
- Finite-state transducer
- Finlands Svenska Television
- Fire Support Team
- First Stop Travel
- Fixation index
- Fleet Survey Team
- Florida Studio Theatre
- Follistatin
- Food technology
- Forced swim test
- Foreign Sports Talent Scheme
- Fort Stockton–Pecos County Airport
- Forward surgical teams
- Foundation for Science and Technology
- Franciscan School of Theology
- Free Southern Theater
- French School of Thessaloniki
- Full-Scale Tunnel
- Sint-Truiden railway station