| Abbreviation | Definition |
|---|---|
| SM | Staff Memorandum |
| SM | Staff Month (20 Days) |
| SM | Submariner |
| SM | Surface Mount |
| SM | Survey Methods |
| SM | System Monitor |
| SM(s) | service member(s) |
| SM1 | Salvage Mechanic First Class |
| SM2 | Salvage Mechanic Second Class |
| SM3 | Salvage Mechanic Third Class |
| SM39 | Exocet Missile (Submarine-Launched) |
| SMA | Safety Mechanism Assembly |
| SMA | Sarasota Military Academy |
| SMA | Self Motivated Agents |
| SMA | Sergeant Major of the Army |
| SMA | Software Maintenance Agreement |
| SMA | Special Military Attaches |
| SMAC | Scene Matching Area Correlator |
| SMACM | Surveilling Miniature Attack Cruise Missile |
| SMAL | Stabilized Mirror Airborne Laser |