| STLV | Simian T-Cell Leukaemia Virus | Biotechnology |
| STR | Structural Requirement | Civil Engineering |
| ST | Short Tons | Transportation › Maritime |
| STAR | Standard Terminal Arrival Route | Aerospace |
| STD | Sao Tome/Principe Dobra | Money › Currency |
| Stg | Staggered | Civil Engineering |
| ST | Samoa Time | Country or Region › Time |
| STW | Search The Web | Message › Chat |
| Stf | Stuffs | Arts and Sports › Football |
| STS | Sequence Tagged Site | Biotechnology |