| Dublin Startup Jobs | Dublin City Council |
| Dublin Tech Summit | Dublin City Council |
| Dublin Web Design | |
| Dún Laoghaire Institute of Art, Design and Technology | Dún Laoghaire-Rathdown County Council |
| Dundalk Institute of Technology | Louth County Council |
| Durweb | |
| DuTec Ltd | Limerick City and County Council |
| DX Compliance | |
| DYNE | |
| Dyno Secure Ireland | |
| e-CARGOWARE Ltd | |
| e-Celtic Ltd | Dublin City Council |
| E-TEC Power Management Ltd | Fingal County Council |
| E-Tech Store | Dún Laoghaire-Rathdown County Council |
| Eagle Media | |
| Easy Payments Plus | |
| Ebow | Dublin City Council |
| EBS | |
| eBuild Web Solutions | |
| ECHAlliance | |
| Echelon Data Centres | |
| Ecom Ireland | Dublin City Council |
| eCom Solutions Ltd | |
| EcomGoLive | Dún Laoghaire-Rathdown County Council |
| EcoWatt | |
| ECS Circuits Ltd | Dublin City Council |
| eCurrency Mint Ltd | |
| Eden Web Studios | Dublin City Council |
| Edev | |
| Edgescan | |
| EdgeTier | |
| EdTech Software Ltd | Mayo County Council |
| Effector | |
| eFlexes Staffing & Recruitment Solutions Ltd | Dublin City Council |
| Egg Design | Cork City Council |
| eGlobe Software | |
| EHA Soft Solutions | Cork City Council |
| eHealth Ireland | |
| EI Electronics | |
| Eiratech Robotics Ltd | |
| Eircode | |
| eircom Ltd | Dublin City Council |
| EireComposites | |
| Eirhost Web Hosting Ireland | Dublin City Council |
| Eirtech Aviation Services | |
| Eirtight Technology | Dublin City Council |
| EKCO | |
| Elara Online Ireland | Dublin City Council |
| Electronic Trade Solutions Ltd | Dublin City Council |
| Element78 | |