| Abbreviation | Definition |
|---|---|
| SCTU | Specialty Care Transport Unit |
| SFD | Sanford Fire Department |
| SFD | Seattle Fire Department |
| SFD | Skaneateles Fire Department |
| SFD | Springfield Fire Department |
| SFFD | San Francisco Fire Department |
| SI | Smoke Inhalation |
| SJFD | San Jose Fire Department |
| SJFD | san josé fire department's |
| SJFD | South Jordan Fire Department |
| SLFD | Skyline Lake Fire Department |
| SLFD | South Lynches Fire District |
| SLFD | Spring Lake Fire Department |
| SLFD | St Louis Fire Department |
| SLFD | Sun Lakes Fire District |
| SMFC | Spring Mill Fire Company |
| SMFD | Santa Monica Fire Department |
| SMFD | South Milwaukee Fire Department |
| SMFF | Salvage and Marine Fire Fighting |
| SOPFEU | Société de protection des forêts contre le feu |