| IDE3 | |
| IDI VIDI d.o.o. | |
| Ignit Group | |
| Ignitech Solutions Ltd | |
| IIT d.o.o. | Primorje-Gorski Kotar |
| IKI d.o.o. | City of Zagreb |
| ILI NET d.o.o. | |
| Illustro d.o.o. | |
| IMAVES d.o.o. | City of Zagreb |
| IMC d.o.o. | |
| Immense d.o.o. | |
| Imunološki zavod | |
| In-con d.o.o. | City of Zagreb |
| IN2 informacijski inženjering d.o.o. | City of Zagreb |
| Inchoo | |
| 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 |
| Infoart d.o.o. | |
| 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 |
| InfoNET d.o.o. | City of Zagreb |
| InfoPlus d.o.o. | City of Zagreb |
| Informatička podrška d.o.o. | City of Zagreb |
| Informel d.o.o. | |
| Infos Plus d.o.o. | |
| Infosistem d.d. | City of Zagreb |
| Infosit Ltd | |
| Infoss Slatina | Virovitica-Podravina |
| Infranet | |
| ING servis | City of Zagreb |
| InGames j.d.o.o. | Primorje-Gorski Kotar |
| ININ d.o.o. | Brod-Posavina |
| Inis d.o.o. | |
| Inity Agency | |
| Innova Software | Varaždin |
| Innovation Ads Croatia | Primorje-Gorski Kotar |
| Innovation Studio | |
| Inpro d.o.o. | Međimurje |
| Insieme j.d.o.o. | Split-Dalmatia |
| InSky Solutions d.o.o. | Zagreb |
| inspiracija.com | City of Zagreb |
| Instal Eršek d.o.o. | City of Zagreb |
| Instar Centar | |