| Abbreviation | Definition |
|---|---|
| DART | Diver Attendant Recompression Transportable |
| DAS | Days At Sea |
| DASA | Defense Atomic Support Agency |
| DAT | Digital Audio Tape |
| DATA | Depth, Air, Time, and Awareness |
| DAWS | Defense Automated Warning System |
| DBCP | Data Buoy Cooperation Council |
| DBDB | Digital Bathymetric DataBase |
| DBDB-V | Digital Bathymetric DataBase - Variable |
| DBS | Double Bottom Ship |
| DC | Depth Control |
| DCOT | Diver Change Out Tool |
| DD | Demonstration Division |
| DDC | Deck Decompression Chamber |
| DDIM | Dry Deposition Inferential Method |
| DDQ | Dutch Dolphin Quest |
| DDR | Deutsche Demokratische Republik |
| DDW | Don't Drink the Water |
| DEAD | Diver Emergency Ascent Device |
| DEC | Digital Equipment Corporation |