| Acronym | Definition |
|---|
| FSSS | Fédération de la Santé et des Services Sociaux (French: Federation of Health and Human Services; Canada) |
| FSSS | Free Super Saver Shipping (Amazon.com) |
| FSSS | Foundation for the Scientific Study of Sexuality |
| FSSS | Fédération Suisse de Sports Subaquatiques |
| FSSS | Foreign Student and Scholar Services (University of Montana) |
| FSSS | Fisher Sub Sieve Sizer |
| FSSS | Fixed-Step Serial Search |
| FSSS | Flight Software Support System |
| FSSS | Field Software Service Support |
| FSSS | Four Seasons Skiing & Snowboarding |
| FSSS | Furnace Safeguard Supervision System (thermal power, steam boilers) |
| FSSS | Fire Suppression Support Services (Willingboro, NJ) |