| DataSector | |
| DB Info | |
| De Pol Trade d.o.o. | |
| Debug IT | City of Zagreb |
| DECODE HQ d.o.o. | |
| Delovski d.o.o. | |
| Design Project | Primorje-Gorski Kotar |
| Design Studio - Novalja | Lika-Senj |
| Design Up / D.N.d.o.o. | |
| Devot | Zagreb |
| Dhar media | |
| Diagram d.o.o. | Split-Dalmatia |
| DigitalTakeover | |
| DigiTech d.o.o. | City of Zagreb |
| Dimedia internet tehnologije d.o.o. | City of Zagreb |
| Dioda d.o.o. | |
| Direct Design | City of Zagreb |
| Dissero d.o.o. | |
| Ditdot do.o. | City of Zagreb |
| Dizzy | City of Zagreb |
| Doliprom d.o.o. | |
| Domino Grupa | City of Zagreb |
| Durabilis d.o.o. | City of Zagreb |
| DVA I - Informatika d.o.o. | City of Zagreb |
| Dvanaest niti d.o.o. | City of Zagreb |
| dzDESIGN | City of Zagreb |
| E-scape Internet usluge | Istria |
| EAG Centar | City of Zagreb |
| Eagle Art Studio | Split-Dalmatia |
| eBurza Grupa d.o.o. | City of Zagreb |
| ECOINA - za zaštitu okoliša d.o.o. | |
| Ed Borel d.o.o. | |
| EDC d.o.o. | City of Zagreb |
| Edinkom d.o.o. | City of Zagreb |
| Effect d.o.o. | |
| Eidos d.o.o. | |
| Ekobit d.o.o. | City of Zagreb |
| Ekolibri | City of Zagreb |
| Elcon d.o.o. | |
| Electronic Center d.o.o. | Osijek-Baranja |
| Elektronika Jug | City of Zagreb |
| Elektronika-MP d.o.o. | City of Zagreb |
| ELKA kabeli d.o.o. | City of Zagreb |
| Elmas d.o.o. | |
| Emineo d.o.o. | |
| Empiria Usluge d.o.o. | City of Zagreb |
| Enconet | |
| Enel Split d.o.o. | Split-Dalmatia |
| EnergoControl Zagreb | |
| Enter d.o.o. | |