| 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) |