| Abbreviation | Definition |
|---|---|
| SESC | Space Environment Services Center |
| SESPA | Scientists and Engineers for Social and Political Action |
| SFE | Supercritical Fluid Extraction |
| SFI | Sports Fishing Initiative |
| SFMR | Stepped Frequency Microwave Radiometer |
| SFO | Satellite Field Office |
| SFOSRC | South Florida Oil Spill Research Center |
| SFSC | Southeast Fisheries Science Center |
| SFSS | Satellite Field Service Station |
| SG | Sea Grant |
| SGW | Shellfish Growing Waters |
| SH | Southern Hemisphere |
| SHARE | Salmon Habitat And Restoration Enhancement |
| SHARE | Software Help in Applications, Research and Education |
| SHC | Shipping Coordination Committee |
| SHEBA | Surface Heat Budget of the Arctic |
| SHIPS | Statistical Hurricane Intensity Prediction Scheme |
| SHR | Shore |
| SHTF | Salmon Harvest Task Force |
| SI | Smithsonian Institute |