| Abbreviation | Definition |
|---|---|
| SSAC | Southern States Athletic Conference |
| SSCA | Southern States Communication Association |
| SSCA | Southern States Correctional Association |
| SSF | Southern States Forwarding |
| SSFL | Southern States Football League |
| SSLA | Southern States Llama Association |
| SSM | Sault Ste. Marie, Michigan |
| SSNED | Small States Network for Economic Development |
| SSSA | Southern States Sign Association |
| STL | Southern Tampa Land |
| STMK | Steiermark (Styria), Germany |
| STSB | States Trading Supervisory Board |
| SUBEB | States Universal Basic Education Boards |
| SUBR | States United for Biomedical Research |
| SUFD | Southwest United Fire Districts |
| SUSB | Statistics of United States Businesses |
| SUSPBA | Southern United States Pipe Band Association (Davenport, FL) |
| SUSTA | Southern United States Trade Association |
| SV | Saginaw Valley |
| SVE | Slattery Vintage Estates |