| Abbreviation | Definition |
|---|---|
| SLAR | Side-Looking Airborne Radar |
| SLB | Single Leaky Bucket |
| SLED | Sea Lion Exclusion Device |
| SLEUTH | System for Locating Eruptive Underwater Turbidity and Hydrography |
| SLH | Southern Lakes Harvest |
| SLIC | Spills, Leaks, Investigations, and Cleanups |
| SLM | Sea Level Measurement |
| SLOSH | Sea Lake and Overland Surges from Hurricanes |
| SLR | Satellite Laser Ranging |
| SLR | Sea-level Rise |
| SLW | Supercooled Liquid Water |
| SMA | State Meteorology Administration |
| SMB | Systems Management Branch |
| SMBL | StratocuMulus-topped Boundary Layer |
| SMCC | System Monitoring and Coordinating Center |
| SMIC | Study of Man's Impact on Climate |
| SMM | Society for Marine Mammalogy |
| SMM | Solar Maximum Mission |
| SMMR | Scanning Multichannel Microwave Radiometer |
| SMO | Science Management Office |