FFS
- Amiga Fast File System
- Brexit
- FFS (album)
- FFS (band)
- FFS Arena
- Facial feminization surgery
- Farmer Field School
- Fee-for-service
- Feige–Fiat–Shamir identification scheme
- Find first set
- Flash file system
- For Film's Sake
- For our Future’s Sake
- Formatted File System
- Frankford Friends School
- Frankfurt South station
- Free-fall sensor
- FreeFileSync
- French Federation of Speleology
- French Frigate Shoals
- Fringe field switching
- Full flight simulator
- Fully fashioned stockings
- People's Vote
- Social Forces Front
- Socialist Forces Front
- Swiss Federal Railways
- Unix File System