| Abbreviation | Definition |
|---|---|
| SMG | Sequential M Gearbox |
| SMG | Sequential Manual Gearbox |
| SMGC | Surface Movement Guidance and Control |
| SMKSCRN | Smoke Screen |
| SMMC | System Maintenance Monitor Console |
| SMOOTH | Santa Maria Organization of Transportation Helpers |
| SMPG | Seat Miles Per Gallon |
| SMPI | Sequential Multipoint Fuel Injection |
| SMPT | Smart Mumbai Public Transport |
| SMPV | Specially Marked Patrol Vehicle |
| SMRT | Singapore Mass Rapid Transit |
| SMRT | Singapore Metro Rail Transit |
| SMS | Safety Management System |
| SMS | Simulation Modeling System |
| SMSA | Standard Metropolitan Statistical Area |
| SMT | Smart Mass Transportation |
| SMT | Standard Motor Transport |
| SMTD | Springfield Mass Transit District |
| SMTS | Southeast Missouri Transportation Service |
| SMTTP | Societe Meridionale de Transport Travaux Publics |