| Acronym | Definition |
|---|
| FSSP | Fraternité Sacerdotale Saint-Pierre (French: Priestly Fraternity of Saint Peter) |
| FSSP | Fold Classification Based on Structure-Structure Alignment of Proteins |
| FSSP | Forward Scattering Spectrometer Probe |
| FSSP | Fraternitas Sacerdotalis Sancti Petri (Priestly Fraternity of Saint Peter) |
| FSSP | Federal Shared Service Provider (US Treasury) |
| FSSP | Fuel System Supply Point |
| FSSP | Flatbush Shomrim Safety Patrol (New York) |
| FSSP | Faculty Subcommittee on Sponsored Programs |
| FSSP | Facility Security and Safety Plan |
| FSSP | Fire Support Specialist (BFIST crew) |