| FSSS | Faculty of Security and Strategic Studies 
| Others |
| FSSS | Family Stigma Stress Scale
| Others |
| FSSS | Fast Simple Sudoku Solver
| Others |
| FSSS | Fast Small Ship Simulator
| Others |
| FSSS | Federal State Statistics Service
| Others |
| FSSS | Federation Suisse de Sports Subaquatiques
| Others |
| FSSS | Federazione Sammarinese Sport Speciali
| Others |
| FSSS | Financial Services Sector Supplement
| Others |
| FSSS | Fisher Sub Sieve Sizer
| Others |
| FSSS | for the Scientific Study of Sexuality
| Others |
| FSSS | Foreign Student and Scholar Services
| Others |
| FSSS | Foreign Student Scholar Services
| Others |
| FSSS | Foundation for the Scientific Study of Sexuality
| Others |
| FSSS | Free Super Saver Shipping
| Others |
| FSSS | Furnace Safeguard Supervision System
| Others |
| FSSS | Furnace Safeguard Supervisory System
| Others |
| FSSS | Furnace secondary standard system
| Others |