| Abbreviation | Definition |
|---|---|
| STAC | Saskatchewan Triathlon Association Corporation |
| STAQ | Science Teachers Association of Queensland |
| STAS | Science Teachers Association of Singapore |
| STB | Société Tunisienne de Banque |
| STFM | Society of Teachers of Family Medicine |
| STICERD | Suntory and Toyota International Centres for Economic and Related Disciplines |
| STLA | Saskatchewan Trial Lawyers Association |
| STLA | South Texas Longhorn Association |
| STLA | Southern Trial Lawyers Association |
| STLD | Society of Television Lighting Directors |
| STLE | Society of Tribologists and Lubrication Engineers |
| STN | Society of Trauma Nurses |
| STOA | Ski Tour Operators Association |
| STP | Society for the Teaching of Psychology |
| STP | Society of Toxicologic Pathology |
| STQC | Southern Tier Quality Connection |
| STS | Service Technicians Society |
| STU | Singapore Teachers Union |
| SUPRA | The Sydney University Postgraduate Representative Association |
| SVM | Society for Vascular Medicine |