| Acronym | Meaning |
 | DIA | U.S. Defense Intelligence Agency |
| DIAC | Department Of Immigration And Citizenship (Australia) [1] |
| DIC | Design Island Centre (computing Usually Used In A Teaching Situation) |
| DICASS | DIrectional Command Activated Sonobuoy System |
| DIF | Data Interchange Format |
| DIFAR | DIrectional Frequency Analysis And Recording |
| DILLIGAF | Do I Look Like I Give A Fuck? (Internet Shorthand) |
| DIME | Dense Inert Metal Explosive |
| DIMM | Dual In-line Memory Module (computing) |
| DINK | Double Income |
| DIP | Dual In-line Package (electronics) |
| DIR | Defence Industrial Research |
| DIS | Defence Intelligence Staff - (U.S.) Defense Investigative Service - Distributed Interactive Simulation - Draft International Standard (ISO) |
| DISA | U.S. Defense Information Systems Agency |
| DISCOM | Division Support Command |
| DISE | Deployable Intelligence Support Element |
| DISSTAF | DIS Search And Target Acquisition Fidelity Experiment |
| DITY | Do-It-Yourself |
| DIV | Dhivehi Language (ISO 639-2 Code) |
| DIVAD | Division Air Defence |
| DIY | Do It Yourself |
| DJ | Disc Jockey - Dinner Jacket -Djibouti (ISO 3166 Digram; FIPS 10-4 Country Code) |
| DJD | Degenerative Joint Disease - Dublin Julian Day - Discoveries In The Judaean Desert |
| DJF | Djibouti Franc (ISO 4217 Currency Code) |
| DJI | Djibouti (ISO 3166 Trigram) |
| DJS | Director |
| DK | Denmark (ISO 3166 Digram) |
| DKK | Danish Krone (ISO 4217 Currency Code) |
| DL | Dexter's Laboratory |
| DLA | U.S. Defense Logistics Agency |
| DLIC | Detachment Left-In-Contact |
| DLIR | Depot-Level Inspection And Repair |
| DLL | Dynamic Link Library |
| DLPFC | DorsoLateral PreFrontal Cortex |
| DLPMC | DorsoLateral PreMotor Cortex |
| DLR | Deutsches Zentrum Fr Luft- Und Raumfahrt (German |
| DLRP | Data Link Reference Point |
| DLS | Deep Lens Survey |
| DLSA | (U.S.) Defense Legal Services Agency |
| DLSC | U.S. Defense Logistics Services Center - U.S. Defense Logistics Support Command - Department Of Library Special Collections (Western Kentucky University Libraries) - Direct Loan Servicing Center - Directorate Of Land Strategic Concepts (Canada) - Dominica |
| DLSC | Diploma In Library Science |
| DLTBGYD | Don't Let The Bastards Grind You Down |
| DM | Dominica (ISO 3166 Digram) -Dungeon Master (role-playing Games) |
| DMA | U.S. Defense Mapping Agency (became NIMA |
| DMC | (U.S.) Defense Management Council |
| DMCA | Digital Millennium Copyright Act |
| DMD | Dentariae Medicinae Doctor (Latin |
| DMI | Desktop Management Interface (computing) |
| DMOC | Distributed Mission Operations Centre |
| DMOS | Double Diffused MOS Transistor (dee-moss) |
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