| Abbreviation | Definition |
|---|---|
| DFCU | Financial Credit Union |
| DFU | Designated Fallen Union |
| DFU | Deutsche Friedens Union |
| DGA | Directors Guild of America |
| DGM | Damned Good Musicians |
| DGR | Dancer Group Representative |
| DGSU | Derbyshire Group Staff Union |
| DGU | Dansk Golf Union |
| DHU | Dansk Hockey Union |
| DISK | Ohne of the Trade Union confederations in Turkey. |
| DIWU | Despatch Industry Workers Union |
| DK | Deva's Kingdom |
| DMCU | Dansk Moto Cross Union |
| DMCU | Diversified Members Credit Union |
| DNU | Dansk Naturist Union |
| DPCU | Dairyland Power Credit Union |
| DPCU | Dakota Plains Credit Union |
| DPCU | Dutch Point Credit Union |
| DPOLG | Deutsche Polizeigewerkschaft (German: German Police Trade Union) |
| DRB | Dispute Review Board |