| Abbreviation | Definition |
|---|---|
| SSF | Swedish Strike Faction |
| SSF | Syrian Security Forces |
| SSG | Special Services Group |
| SSG | Special Services Group (Pakistan) |
| SSG | Special Services Group (SSG) |
| SSG | Special Study Group |
| SSG | Staff Sergeant |
| SSG | Surveillance Specialist Group |
| SSG | Systems Support Group |
| SSGL | Senior Small Group Leader (US Army) |
| SSGT | Staff Sergeant |
| SSI | Secret Special Intelligence |
| SSI | Section For Searching And Intercepting |
| SSI | Single Shot Interchangeable |
| SSI | Soldier System Interface |
| SSI | Special Skill Identifier |
| SSI | Standing Signal Instruction |
| SSIA | South Sudan Independence Army |
| SSIC | System Safety Integration Contractor |
| SSIMU | Solid State Inertial Measurement Unit |