| Abbreviation | Definition |
|---|---|
| SLSMC | St. Lawrence Seaway Management Corporation |
| SLTS | Space Launch and Transportation System |
| SLV | Satellite Launching Vehicle |
| SLV | Small Launch Vehicle |
| SLV | Standard Launch Vehicle |
| SM | Side Mounted |
| SM | Smart Mobility |
| SM | Statute Mile |
| SMAC | Simulation Model Of Automobile Collisions |
| SMART | State and Metropolitan Analyses of Regional Transportation |
| SMART | Stormwater Management And Road Tunnel |
| SMART | Students of Missouri Assisting Rural Transportation |
| SMART | Suburban Mobility Authority for Regional Transportation |
| SMATS | Saginaw Metropolitan Area Transportation Study |
| SMATS | Sarasota Manatee Area Transportation Study |
| SMATS | Spokane Metropolitan Area Transportation Study |
| SMCP | Standard Marine Communication Phrases |
| SMD | Service and Methods Demonstration |
| SMF | Sacramento Metropolitan Airport |
| SMFIR | Shaped Magnetic Field in Resonance |