FS
- APFSDS
- C0 and C1 control codes
- FS (musician)
- FS Film
- FS Services
- FS register
- Fagoppositionens Sammenslutning
- FamilySearch
- Farmers' and Settlers' Association of New South Wales
- Feature structure
- Federal Signal
- Federal Standard 595
- Feldspar
- Felty's syndrome
- Femtosecond
- Femtosiemens
- Ferrocarril de Sóller
- Ferrovie dello Stato Italiane
- Fibrin sealant
- File server
- File system
- Financial Secretary (Hong Kong)
- Fine structure
- Fire support
- First ScotRail
- Flank speed
- Flight Sergeant
- Flight Surgeon
- Flight simulation video game
- Flight simulator
- Flipnote Studio
- Flyr (airline)
- For Sale (disambiguation)
- Formula Student
- Formularium Slovenicum
- Fortune Systems
- Forward secrecy
- Foundation Stage
- Fourier series
- Fox Sports (United States)
- Fox Sports 1
- Fox Sports 2
- Fractional shortening
- Frameshift mutation
- Franco's Spain
- Free safety
- Free skating
- French Navy
- French Southern Territories
- Fujita scale
- Full Sail University
- Full scale
- Full service (disambiguation)
- Future Shop
- HEAT
- IBM Future Systems project
- ItAli Airlines
- List of compositions by Carl Nielsen
- Marine flooding surface
- Microsoft Flight Simulator
- Microsoft Flight Simulator (2020 video game)
- Microsoft Flight Simulator X
- Sampling rate
- Siemens (unit)
- Trenitalia