| Abbreviation | Definition |
|---|---|
| SLRTC | Sierra Leone Road Transport Corporation |
| SLRTC | Sierra Leone Road Transportation Corporation |
| SLRTC | Sierra Leone Roads Transport Corporation |
| SLS | Sea-Land Service |
| SLS | Shipping List Service |
| SLSDC | Saint Lawrence Seaway Development Corporation |
| SLSI | Superior Laboratory Services Inc |
| SLT | Segment Lager Technik |
| SLT | Sri Lanka Telecom |
| SLT | Studio Leon Thier |
| SLT | Sweet Leaf Tea |
| SLU | Sociedad Limitada Unipersonal |
| SLV | Stone Lion Ventures |
| SLW | Sayles Lidji Werbner - Corporate Law |
| SLWB | Sahtu Land and Water Board |
| SLWC | Seavy Loop Water Company |
| SM | Samsung Motors |
| SM | Singer Machine |
| SM | Stone Mill |
| SMA | Schaefer, Matossi, and Aderhold |