STSL
| Acronym | Definition |
|---|---|
| STSL | Sea Turtle Survival League |
| STSL | Subhiksha Trading Services Ltd. (est. 1997; India) |
| STSL | Solidarity Trust Services Limited (Jersey Channel Islands) |
| STSL | Spanco Telesystems and Solutions, Ltd. (Mumbai, India) |
| STSL | Siemens Transportation Systems Limited (UK) |
| STSL | Short-Term Selected Line (animal genes) |