| Abbreviation | Definition |
|---|---|
| SSSC | Surface, Subsurface Search Surveillance Coordination |
| SSSI | Site Of Special Scientific Interest |
| SSSS | Silent Sound Spread Spectrum |
| SSSSS | Shout, Show, Shove, Shoot to warn, Shoot to wound |
| SST | Short Supervisory Transition |
| SST | Single Subscriber Terminal |
| SST | Special Service Tool |
| SST | Special Support Team (National Security Agency) |
| SST | SuperSonic Transport |
| SST | System Software Test |
| SST | System Support Team |
| SSTATS | System Statistics Data |
| SSTB | Salton Sea Test Base |
| SSTD | Surface Ship Torpedo Defence |
| SSTD | Surface Ship Torpedo Defense |
| SSTG | Ship Safe Training Group |
| SSTG | Ships Service Turbine Generator |
| SSTG | Submarine Sea Training Group |
| SSTG | Supply Support Technology Group |
| SSTM | Single Service Training Manager |