| Abbreviation | Definition |
|---|---|
| DI | Drill Instructor |
| DI | Dynamic Interface |
| DI&T | Design, Integration, and Test |
| DIA/DHX | Defense Intelligence Agency, Directorate of Human Intelligence, Office of Document and Media Operations |
| DIAC | Defense Intelligence Analysis Center |
| DIAG | Diagram |
| DIAG | Disarmament Illegal Armed Group |
| DIAM | Defense Intelligence Agency Manual |
| DIAM | Defense Intelligence Agency Memorandum |
| DIAOLS | DIA On Line System |
| DIAP | Defense Intelligence Analysis Program |
| DIAR | Defense Intelligence Agency (DIA) Regulation |
| DIAR | Defense Intelligence Agency Regulation |
| DIAS | Draw Includes All Survivors |
| DIAV | Directorate of Indian Army Veterans |
| DIB | Defense Industrial Base |
| DIBBL | Dismounted Infantry Battle Space Battle Lab |
| DIBITS | Digital In-Band Interswitch Trunk Signaling |
| DIBRS | Defense Incident-Based Reporting System |
| DIBTS | Digital In-Band Trunk Signaling |