| Abbreviation | Definition |
|---|---|
| FSI | Swiss Federation of Information Processing Societies |
| FSIF | Friendly Society of Iron Founders |
| FSLC | Film Society of Lincoln Center |
| FSME | Frontenac Society of Model Engineers |
| FSMS | Florida Surveying and Mapping Society |
| FSP | Florida Society of Pathologists |
| FSPA | Fellow of the American Society of Pension Actuaries |
| FSPA | Fellow Society of Pension Actuaries |
| FSR | Florida Society of Rheumatology |
| FSRT | Florida Society of Radiologic Technologists |
| FSS | Florida Soaring Society |
| FSSA | Field Spaniel Society of America |
| FSSSSS | Florida Select Society of Sanitary Sludge Shovelers |
| FSSW | Family and Society Studies Worldwide |
| FSUC | Filk Society of Upper Canada |
| FSW | Flute Society of Washington |
| FTESLC | Fdration TESL du Canada |
| FTESLC | Fédération TESL du Canada |
| FTESLC | TESL Canada Federation |
| FTSA | Flight Test Society of Australia |