| Name | Type | Country |
|---|---|---|
| Datinet | Enterprise | Spain |
| dbh Logistics | Enterprise | Germany |
| DEEP BLUE SRL | Enterprise | |
| DeustoTech | Foundation | Spain |
| Dimetronic | Enterprise | Spain |
| DIMOS THESSALONIKIS | Public administration | |
| Dinycon Sistemas | Enterprise | Spain |
| Diputación foral de Bizkaia | Public administration | Spain |
| Donostia Turismo | Enterprise | Spain |
| DunavNET | Enterprise | Serbia |