| Acronym | Meaning |
 | D | Deci |
| D | Deuterium |
| D&D | Dungeons And Dragons - Diversion And Distress (Air Traffic Control) |
| D/B/A | Doing Business As |
| DA | Danish Language (ISO 639-1 Code) - Deca |
| DA | Denmark (FIPS 10-4 Country Code) -U.S. Department Of The Army - District Attorney |
| DA&M | (U.S.) Director |
| DACT | Data Automated Communications Terminal - Dissimilar Air Combat Training |
| DADVSI | Loi Sur Le Droit D?auteur Et Les Droits Voisins Dans La Soci?t? De L?information (French |
| DAES | Defence Acquisition Executive Summary - (UK MoD) Directorate Of Analysis |
| DAF | Dissolved Air Flotation |
| DAFIF | Digital Aeronautical Flight Information File |
| DAK | Disney's Animal Kingdom |
| DAN | Danish Language (ISO 639-2 Code) |
| DAO | Division Ammunition Officer |
| DAQ | Data Acquisition -Delivered Audio Quality |
| DARO | (U.S.) Defense Airborne Reconnaissance Office |
| DARPA | U. S. Defense Advanced Research Projects Agency |
| DART | Disaster Assistance Response Team - Dublin Area Rapid Transit |
| DAS | Defensive Aids Suite |
| DASD | (U.S.) Deputy Assistant Secretary Of Defense |
| DASL | Datapoint's Advanced System Language |
| DAU | (U.S.) Defense Acquisition University |
| DAWN | (U.S.) Drug Abuse Warning Network |
| DB | Database - Deutsche Bahn |
| DB | Decibel |
| DB | Dubnium |
| DBA | De Bellis Antiquitatis (miniature Wargaming Rules) |
| DBBL | (U.S. Army Simulation Center) Dismounted Battlespace Battle Laboratory |
| DBCS | Double-Byte Character Set |
| DBDO | Desert BDO |
| DBE | Dame Commander Of The Order Of The British Empire |
| DBF | Detection By Fire (weapon Launch Signature) |
| DBM | De Bellis Multitudinis (miniature Wargaming Rules) - Detection By Movement (military Target) |
| DBR | De Bellis Renationis (miniature Wargaming Rules) |
| DBS | Direct Broadcast Services (television) |
| DC | Da Capo - Italian Democrazia Cristiana - Digital Compass - Direct Current -District Of Columbia (postal Symbol) -Douglas Aircraft Company - Dublin Core - Duty Cycle |
| DCA | Defensive Counter Air ?DiChloroAcetate -Ronald Reagan Washington National Airport (IATA Code) |
| DCAA | (U.S.) Defense Contract Audit Agency |
| DCAS | Devon And Cornwall Archery Society |
| DCC | Dallas Christian College |
| DCC | Digital Command Control (model Railroading) - Direct Client-to-Client (Internet Relay Chat) - Dismounted Close Combat |
| DCCP | Datagram Congestion Control Protocol |
| DCD | [Organ] Donation After Cardiac Death |
| DCE | Data Communication Equipment |
| DCFC | Death Cab For Cutie |
| DCI | Detection |
| DCIM | Digital Camera Images |
| DCIMS | Dental Classification Information Management System - Dismounted Combat Identification Marking System |
| DCOM | Disney Channel Original Movie |
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