| Abbreviation | Definition |
|---|---|
| SS | Susquehanna Section |
| SSA | Safe School Ambassadors |
| SSA | Society for the Study of Addiction |
| SSA | Society of St. Andrew |
| SSA | Survivors of Sexual Assault |
| SSAP | Sustainable Society Action Project, Inc. |
| SSBA | Saskatchewan School Based Administrators |
| SSCC | Sullivan Senior Citizen Center |
| SSCP | Southwest Subzone Community Policing |
| SSCS | Sea Shepherd Conservation Society |
| SSD | Susquehanna Service Dogs |
| SSE | Society for Scientific Exploration |
| SSE | Society of Sales Executives |
| SSE | Syrentha Savio Endowment |
| SSEC | Social Science Education Consortium |
| SSF | Sjögren's Syndrome Foundation |
| SSF | Sociologists Sin Frontiers |
| SSFI | Sjögren's Syndrome Foundation, Inc. |
| SSHRC | Social Sciences and Humanities Research Council of Canada |
| SSI | Spastics Society of India |