| Abbreviation | Definition |
|---|---|
| FESI | Federación Española de Sociedades de Informática |
| FESI | Spanish Federation of Computer Societies |
| FESPB | Federation of European Societies of Plant Biology |
| FFAS | Foothills Fetal Alcohol Society |
| FFHS | Federation of Family History Societies |
| FFHS | Friends Forever Humane Society |
| FFSB | Federation of Film Societies of Bangladesh |
| FFSBC | Freshwater Fisheries Society of British Columbia (Victoria, BC, Canada) |
| FFSS | Free Funeral Service Society |
| FFSS | Free Funeral Services Society |
| FGMS | Fallbrook Gem and Mineral Society |
| FGMS | Fallbrook Gem Mineral Society |
| FHCS | Fulham and Hammersmith Choral Society |
| FHCS | Fulham Hammersmith Choral Society |
| FHHS | Fort Hays Honor Society |
| FHRS | Fellow of the Heart Rhythm Society |
| FHRS | Fellows of the Heart Rhythm Society |
| FHS | Friesian Horse Society |
| FI | Foresight Institute |
| FID | Fdration Internationale d'Information et de Documentation |