Fs
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fs or FS may stand for:
- femtosecond (fs), "femto" and "second"
- Ferrocarril de Sóller (FS), railway on Majorca
- Ferrovie dello Stato (FS), Italian railways
- FS technology, a project studied by IBM in the early seventies.
- file system
- Francos Spain
- Fourier series
- FS, a Mazda piston engine
- Flagship Studios, a computer game company
- "French ship", a NATO prefix for ships of the French Navy
- Fin-stabilized projectiles, such as APFSDS or HEAT-FS ammunition for a tank gun.