| Abbreviation | Definition |
|---|---|
| SSO | Special Security Office |
| SSO | Special Security Office(R) |
| SSO | Spot Security Office |
| SSO | System Security Officer |
| SSO | System Staff Officer |
| SSORD | Service Support Order |
| SSP | Scientific Services Program |
| SSP | Secret Space Program |
| SSP | SIGINT (SIGnals INTelligence) Support Plan |
| SSP | Single Source Processor |
| SSP | Single Stock Point |
| SSP | Source Selection Plan |
| SSP | Strategic Systems Program |
| SSP | Support Strategies And Planning |
| SSP | Support Strategies Planning |
| SSP | System Safety Program |
| SSP | System Support Package |
| SSPA | South Sudan Patriotic Army |
| SSPARS | Solid-State Phased Array Radar System |
| SSPDF | South Sudan Peoples Defense Forces |