| Inkjet.ie | Monaghan County Council |
| Innovation Value Institute | |
| Insight Consultants | |
| Insight HR | |
| Insight Multimedia | Cork City Council |
| Inspiration | Dún Laoghaire-Rathdown County Council |
| Instillo Ltd | |
| Institute of Technology Blanchardstown | Fingal County Council |
| Institute of Technology Carlow | Carlow County Council |
| Institute of Technology Sligo | Sligo County Council |
| Institute of Technology Tallaght | South Dublin County Council |
| Institute of Technology Tralee | Kerry County Council |
| Intact Software | Louth County Council |
| Integrity360 | Dún Laoghaire-Rathdown County Council |
| Intelligent Implants | |
| Intelligo Software Ltd | Wicklow County Council |
| Inter-Tec Aero Ltd | |
| Intercomms | Tipperary County Council |
| International Centre for Security Intelligence | Galway City Council |
| Internet Neutral Exchange Association | Dublin City Council |
| Intouch.com | |
| Intuition | Dublin City Council |
| InVera Medical | |
| Ionic Business Systems Ltd | Dublin City Council |
| IP Telecom | |
| IPAG (Internet) Ltd | Dublin City Council |
| iPod Rescue | Galway City Council |
| Ireland SEO | |
| Ireland Strategic Investment Fund | |
| Ireland's High-Performance Computing Centre | Galway City Council |
| Ireland's Technolog Blog | Dublin City Council |
| Irish Computer Society | Dublin City Council |
| Irish Development | Dublin City Council |
| Irish Domains | Dublin City Council |
| Irish Free Software Organisation | Dublin City Council |
| Irish Organisation for Geographic Information | Kildare County Council |
| Irish Recruiter | Dublin City Council |
| Irish Research Council | |
| Irish Security Industry Association | Dublin City Council |
| Irish Tech News | Dublin City Council |
| Irish University Business School | |
| Irish Venture Capital Association | Wicklow County Council |
| Irish Web Hosting Servers | Dublin City Council |
| Irishcom | Dublin City Council |
| IrishHosting.net | Dublin City Council |
| Irrus Investments | Limerick City and County Council |
| Island Bridge Networks | |
| Íslandsbanki | Southwest Constituency |
| Isle Expert Systems Ltd | |
| Istech Web Design | Kilkenny County Council |