| GemBox Ltd | |
| Generation Stars | Primorje-Gorski Kotar |
| Genesis d.o.o. | Primorje-Gorski Kotar |
| Geogis d.o.o. | |
| Geosat d.o.o. | City of Zagreb |
| Getim d.o.o. | City of Zagreb |
| Gigabit Adria d.o.o. | Primorje-Gorski Kotar |
| GIS Cloud Ltd | Zagreb |
| Gleninvest d.o.o. | |
| Globaldizajn | City of Zagreb |
| Globus Marine international d.o.o. | |
| GoodCode | |
| Gorila IT d.o.o. | |
| Green Future Conference | |
| Green Light Technologies | |
| Gutel | City of Zagreb |
| GvG d.o.o. | Zagreb |
| H.I.P. d.o.o. | |
| Hamag Bicro | |
| Hand Studio Zagreb | City of Zagreb |
| Hanna Hosting | City of Zagreb |
| HashCode | |
| HEADER Ltd | |
| HELD d.o.o. | City of Zagreb |
| Heliobit d.o.o. | Split-Dalmatia |
| Helix d.o.o. | City of Zagreb |
| Heron Electronic d.o.o. | Brod-Posavina |
| Hewlett Packard d.o.o. | City of Zagreb |
| Hexis | |
| HGSHOP | City of Zagreb |
| Hitna PC Služba | City of Zagreb |
| HM-PROMOTION d.o.o. | City of Zagreb |
| Hobit Computers | Primorje-Gorski Kotar |
| Holofiction | |
| Hosting Centar d.o.o. | City of Zagreb |
| House of Code | |
| Hrvatska akademija znanosti i umjetnosti | |
| Hrvatska regulatorna agencija za mrežne djelatnosti | City of Zagreb |
| Hrvatska udruga Oracle korisnika | City of Zagreb |
| Hrvatski informatički zbor | City of Zagreb |
| Hrvatski institut za povijest | |
| Hrvatski savez informatičara | |
| Hrvatski Telekom d.d. | City of Zagreb |
| Hrvatski zavod za javno zdravstvo | |
| Hrvatski zavod za transfuzijsku medicinu | |
| Hrvatsko katoličko sveučilište | |
| Human Sense Moves | City of Zagreb |
| I.P.T. d.o.o. | City of Zagreb |
| Icon Internet Studio | City of Zagreb |
| IDB Mobile Technology | City of Zagreb |