| Abbreviation | Definition |
|---|---|
| DEH | Division of Environmental Health |
| DEHC | Dorchester Environmental Health Coalition |
| DEHE | Degrade Ecosystems/Habitats/the Environment |
| DEHS | Department of Environmental Health and Safety |
| DEHS | Division of Environmental Health and Sustainability |
| DEHS | Division of Environmental Health Services |
| DEIC | Defense Environmental International Cooperation |
| DELO | Deputy Environmental Liaison Officer |
| DELTA | Developing Environmental Leadership Towards Action |
| DEMG | Delcan Environmental Management Group |
| DEMG | Director Environmental Monitoring and Governance |
| DEMT | Disaster Environmental Management Trust |
| DENR | Directorate Of Environmental And Natural Resources |
| DEOE | Division of Environmental and Occupational Epidemiology |
| DEOM | Department of Environmental and Occupational Medicine |
| DEOS | Delaware Environmental Observing System |
| DEP | Department for Environmental Protection |
| DEP | Department of Environmental Protection |
| DEP | Department of Environmental Protections |
| DEP | Deplorable Environmental Policies |