| 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 |
| 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 |
| HGSHOP | City of Zagreb |
| Hitna PC Služba | City of Zagreb |
| HM-PROMOTION d.o.o. | City of Zagreb |
| Hobit Computers | Primorje-Gorski Kotar |
| Hosting Centar d.o.o. | City of Zagreb |
| 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 Telekom d.d. | |
| 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 |
| IDI VIDI d.o.o. | |
| IIT d.o.o. | Primorje-Gorski Kotar |
| IKI d.o.o. | City of Zagreb |
| Illustro d.o.o. | |
| IMAVES d.o.o. | City of Zagreb |
| IMC d.o.o. | |
| Imex Banka | Zagreb |
| Imunološki zavod | |
| In-con d.o.o. | City of Zagreb |
| IN2 informacijski inženjering d.o.o. | City of Zagreb |
| Inchoo d.o.o. | Osijek-Baranja |
| INEA CR d.o.o. | City of Zagreb |
| INFO d.o.o. | |
| Info izlog d.o.o. | Brod-Posavina |
| Info zona | |
| Info-kod d.o.o. | City of Zagreb |
| INFO-TECH Obrt | Osijek-Baranja |
| Infokom Software & Consulting d.o.o. | Split-Dalmatia |
| InfoLAB e.i.d.o.o. | City of Zagreb |
| Infomare d.o.o. | City of Zagreb |
| Infomodul d.o.o. | Varaždin |