| DAN | Divers Alert Network | - | SMS Chat and Text |
| DCAP | Decompression Computation And Analysis Program | - | SMS Chat and Text |
| DCI | Decompression Illness | - | SMS Chat and Text |
| DCS | Decompression Sickness | - | SMS Chat and Text |
| DEMA | Diving Equipment Manufacturers Association | - | SMS Chat and Text |
| DIN | Deutsches Insitut Fuer Normung | - | SMS Chat and Text |
| DIR | Doing It Right | - | SMS Chat and Text |
| DL | Dive Leader (BSAC) | - | SMS Chat and Text |
| DM | Dive Master (PADI) | - | SMS Chat and Text |
| DO | Dive Officer (BSAC) | - | SMS Chat and Text |
| DPV | Diver Propulsion Vehicle | - | SMS Chat and Text |
| DSMB | Delayed Surface Marker Buoy | - | SMS Chat and Text |
| DV | Demand Valve | - | SMS Chat and Text |
