| Dansk Fundamental Metrologi | |
| Dansk Internet Forum | Capital Region of Denmark |
| Dansk IT | Capital Region of Denmark |
| Danske Commodities | |
| Danske Lønsystemer A/S | Capital Region of Denmark |
| Danske Slagterier | |
| DanSolar Energi ApS | |
| DAPA A/S | |
| Data & More ApS | |
| Data Center Map | Region of Southern Denmark |
| Data-Link ApS | |
| Databoks ApS | Capital Region of Denmark |
| Datacon | Capital Region of Denmark |
| Datahjaelp | Central Denmark Region |
| Datalogik A/S | |
| DataManix | |
| Datamarked.dk | North Jutland Region |
| Dataminds A/S | |
| Dataproces Group A/S | |
| Datapult | |
| DataSign | |
| Datatilsynet | Capital Region of Denmark |
| Datawareness ApS | |
| Dataworld A/S | |
| Dawn Health | |
| DBA Consult | |
| DBVision | Capital Region of Denmark |
| Debbie | |
| Debriefing Software A/S | Central Denmark Region |
| Delegate | |
| Delfi Technologies A/S | Region Zealand |
| Delogue PLM | |
| Delta Data Udvikling A/S | North Jutland Region |
| DeltaShop.dk Thornedahl ApS | Capital Region of Denmark |
| Deluxe Media | |
| Den Danske Scenekunstskole | |
| Den Jyske Håndværkerskole | |
| Denver Electronics A/S | Central Denmark Region |
| Design'r'us | Central Denmark Region |
| Designskolen Kolding | |
| Det Kongelige Akademi - Arkitektur, Design, Konservering | |
| Det Nationale Forskningscenter for Arbejdsmilj | |
| Detectronic A/S | North Jutland Region |
| Develco A/S | |
| Develco Products A/S | |
| Develop Diverse | |
| Dezide ApS | North Jutland Region |
| DiaPhoni A/S | North Jutland Region |
| Difento | |
| Digibate | |