| Abbreviation | Definition |
|---|---|
| DEO | Divisional Enquiry Officer |
| DEP | Detoxification Elimination Provocation |
| Det | detective |
| DETR | Department of the Environment Transport and the Regions |
| DETSUPT | Detective Superintendent |
| DEU | Drug Enforcement Unit |
| DEUCE | Intoxicated Driver |
| DFA | Director of Finance and Administration |
| DFC | Digital Forensic Corp |
| DFES | Department For Education and Skills |
| DFF | Digital Forensic Framework |
| DFO | Designated Firearm Officer |
| DGI | Digital Gangstas Incorporated |
| DGP | Director General of Police |
| DGU | Defensive Gun Use |
| DI | Destination Inspection |
| DI | Detective Inspector |
| DIA | Department of Internal Affairs |
| DID | Drunk and Impaired Drivers Program |
| DIE | Delinquents In Exeter |