| Acronym | Definition |
|---|
| FFS | Fee-For-Service |
| FFS | Fast File System |
| FFS | Farmer Field School |
| FFS | Form Fill Seal (packaging) |
| FFS | Flash File System (method of making flash memory appear as a disk drive) |
| FFS | Fédération Française de Ski (French) |
| FFS | Ferrovie Federali Svizzere (Swiss Railway) |
| FFS | Fringe-Field Switching (Hyundai Electronics) |
| FFS | Full Flight Simulator |
| FFS | Facial Feminization Surgery |
| FFS | Front des Forces Socialistes |
| FFS | Focused Feasibility Study |
| FFS | For Further Study |
| FFS | Fédération Française de Surf (French) |
| FFS | Federal Financial System |
| FFS | Freedom from Smoking (American Lung Association; smoking cessation) |
| FFS | Flash Flood Statement |
| FFS | Free Fall Sensor (hard disk drives) |
| FFS | Federal Financial System (a software product) |
| FFS | Friends for Sale (Facebook application) |
| FFS | Fertility and Family Surveys |
| FFS | Fund Fact Sheet |
| FFS | Free Flow Speed (highway capacity, civil engineering) |
| FFS | Fat Finger Syndrome |
| FFS | Farmers Financial Solutions |
| FFS | Farms for Schools (UK) |
| FFS | Flexible Fertigungs-Systeme (Germany) |
| FFS | Föderation Freiheitlicher Sozialisten (German) |
| FFS | Fast Filing System (BSD, Unix) |
| FFS | Fallback Fault-tolerant Server |
| FFS | Final Focus System |
| FFS | Formatted File System |
| FFS | Femoral-Facial Syndrome |
| FFS | Fast Full Search (algorithm) |
| FFS | Firewall Feature Set (Cisco router) |
| FFS | False Financial Statements (auditing) |
| FFS | FearFul Silence (gaming clan) |
| FFS | Freie Fettsäure (German: free fatty acid) |
| FFS | Feedback Fuel System (fuel injection in internal combustion engines) |
| FFS | Flood/Flash Flood Statement (US NOAA) |
| FFS | Formation Flight System (US DoD) |
| FFS | Florida Folklore Society |
| FFS | Fish Finger Sandwich (British pub snack food) |
| FFS | Freedom for Some (internet news) |
| FFS | Frankford Friends School (Philadelphia, PA) |
| FFS | For Freak's Sake (polite form) |
| FFS | Fault-Free Set |
| FFS | Fast Frequency Sweep |
| FFS | Flame Fluorescence Spectroscopy |
| FFS | Flash File Standard |
| FFS | Funded Feasibility Study |
| FFS | Fingal Farm Supply (Ontario, Canada) |
| FFS | Force Feel System |
| FFS | Fiatalok Fotómuvészeti Stúdiója (Hungarian: Studio of Young Photographers; Budapest, Hungary; est. 1977) |
| FFS | Full-Flow Settling (pond) |
| FFS | Future Finance System |
| FFS | Fire and Forget Seeker |
| FFS | Fight or Flight System |
| FFS | Fully Fashioned Stocking |
| FFS | Front Forces de Socialiste (Socialist Forces Front; political party, Algeria) |
| FFS | Fuze Function Setter |
| FFS | Fumble Finger Syndrome |
| FFS | Fat Friend Syndrome |
| FFS | Fat Face Syndrome (appearance) |
| FFS | Failure to Fasten Seatbelt (traffic violation) |
| FFS | ForFakeSight (band) |
| FFS | Forum for Free Speech |
| FFS | Fire Fighting System |
| FFS | Family Fun Stuff (gaming) |
| FFS | Future Funk Squad |
| FFS | Fly Fishing School |
| FFS | Florida Forest Service (Tallahassee, FL) |