| Abbreviation | Definition |
|---|---|
| DDZ | Decor D Zign |
| DE | Dailey Enterprizes |
| DE | Delaware Ed's |
| DEAC | Design Engineering Analysis Corporation |
| DEAI | Developmental Educators Australia Inc |
| DEBC | Deep Ellum Brewing Company |
| DEBI | Devon Environmental Business Initiative |
| DEC | Dana Energy Company |
| DEC | Digital Equipment Company |
| DEC | Digital Equipment Corp |
| DEC | Digital Equipment Corporation |
| DEC | Dynamic Environmental Corporation |
| DECCA | Development and Construction Corporation of America |
| DECI | Document Engineering Company, Inc. |
| DECI | Downtown Eau Claire Inc |
| DEDO | Delaware Economic Development |
| DEEP | Deep Earth Energy Production |
| DEG | Diamond Eyes Graphics |
| DEGC | Detroit Economic Growth Corporation |
| DEGS | Dalhousie Engineering Graduate Society |