| SSSR | Save the Scenic Santa Ritas 
| Others |
| SSSR | Small Signal Stability Region
| Others |
| SSSR | Smallest Set Of Smallest Rings
| Others |
| SSSR | Society for the Scientific Study of Reading
| Others |
| SSSR | Society for the Scientific Study of Religion
| Others |
| SSSR | South Side Street Rods
| Others |
| SSSR | Southern State Street Rodders
| Others |
| SSSR | Soyuz Sovetskikh Sotsialisticheskikh Respublik
| Others |
| SSSR | Soyuz Sovietskich Socialisticeskich Respublik
| Others |
| SSSR | Soyuz Sovietskiy Sotsialisticheskiy Respublik
| Others |
| SSSR | Stochastic Screen Space Reflections
| Others |
| SSSR | Studies in Social Science Research
| Others |
| SSSR | Super Sports Sedan Racing
| Others |
| SSSR | Support To Security Sector Reform
| Others |