| Digital Jet | |
| Digital Lab | |
| Digital Learning Institute | |
| Digital Locker | |
| Digital Marketing | |
| Digital Marketing Institute | Dún Laoghaire-Rathdown County Council |
| Digital Print Hub Ltd | |
| Digital Rights Ireland | |
| Digital Sales | |
| Digital Skillnet | |
| Digital Strategy Consultants Ltd | |
| Digital Times Ltd | Dún Laoghaire-Rathdown County Council |
| DigiTally | |
| DigitalWell | |
| Digiweb Ltd | Louth County Council |
| Dimply | |
| Ding | Dublin City Council |
| Discover Digital | Limerick City and County Council |
| Discoverprint | |
| Dmac Media | Sligo County Council |
| DMC Consultancy Ltd | |
| DMC Learning | |
| DMF Systems | |
| Dogpatch Labs | Dublin City Council |
| Dönberg Electronics Ltd | Donegal County Council |
| Donegal Web Design | Donegal County Council |
| doop | Dublin City Council |
| Dorset College Dublin | |
| DoSpace | |
| Dotdash | |
| Dotser | Dublin City Council |
| dotU.co.uk | Roscommon County Council |
| Douglas Control & Automation | Cork City Council |
| Dovetail | Dublin City Council |
| Drawinginc | South Dublin County Council |
| Dream Digital | |
| DreamDev Technologies Ltd | |
| Dropdown | |
| Druid Software | |
| DS Biopharma Ltd | |
| DTL Systems Ltd | Dublin City Council |
| Dublin BIC | Dublin City Council |
| Dublin Business School | Dublin City Council |
| Dublin City University | Dublin City Council |
| Dublin City University - Mathematical Sciences | Dublin City Council |
| Dublin City University - School of Computing | Dublin City Council |
| Dublin Institute for Advanced Studies | |
| Dublin SEO Company | |
| Dublin SEO Expert | |
| Dublin Startup Community Fund | |