| Abbreviation | Definition |
|---|---|
| SCSP | South China Sea Fisheries Development and Coordinating Program |
| SCUBA | Self Contained Underwater Breathing Apparatus |
| SCUBA | Self-Contained Underwater Breathing Apparatus |
| SDA | Specific Dynamic Action |
| SDA | Survey Documentation and Analysis |
| SDB | Systems Development Branch |
| SDC | Submersible Decompression Chamber |
| SDD | Systems Development Division |
| SDJ | Starter Drill Jig |
| SDL | Submersible Diving Lockout |
| SDP | Shear Deformable Plate |
| SDS | Safety Data Sheet |
| SDV | Swimmer Delivery Vehicle |
| SE | Surface Effect |
| SEA | Scientific Exploration Of Atlantis |
| SEA | State Earthquake Administration |
| SEABEAM | Shipboard multi-transducer swath echo sounding system |
| SEABEAM | Swath Echo sounding multi-transducer BEAM system |
| SEACAT | SeaBird Conductivity and Temperature Recorder |
| SEADAS | SeaWiFS Data Analysis System |