| The Digital Department | |
| The Digital Health Society | |
| The Digital Hub | Dublin City Council |
| The Good Software Company | Fingal County Council |
| The Tara Building | |
| The Unit Ltd | |
| TheDesignPool | Dún Laoghaire-Rathdown County Council |
| Thenet.ie | Dublin City Council |
| Thesaurus Software Ltd | Meath County Council |
| ThinScale Technology Ltd | |
| Threadable | |
| Thriftify | |
| Thrive Digital | |
| Tidy Web Development | Dublin City Council |
| TimePoint | South Dublin County Council |
| Timewise Systems | |
| Tines | |
| Tipple Operations Ltd | |
| TitanHQ | |
| Tito | Dublin City Council |
| TLD Registry Ltd | |
| Together Digital | |
| Tom Smyth & Associates | |
| Top Digital Agency Ltd | |
| Topmail Ltd | Dublin City Council |
| TopSecTechnology | Dublin City Council |
| Torc Web Design | Westmeath County Council |
| Total Digital | |
| Touchapps | |
| Touchapps | |
| Townapps | |
| Tr3Dent | Galway City Council |
| TransferMate | |
| Tranzaura | |
| Tranzaura | |
| TRC Solutions Ireland | Dún Laoghaire-Rathdown County Council |
| Treetop Studio | |
| Tribal City Interactive Ltd | |
| Trigger Communication | Galway City Council |
| Trinity Biotech plc | |
| Trinity Biotech plc | |
| Trinity College Dublin - School of Computer Science and Statistics | Dublin City Council |
| Trinity College Dublin - School of Mathematics | Dublin City Council |
| Trinity College Dublin, The University of Dublin | Dublin City Council |
| TripAdmit | |
| Trojan IT | Roscommon County Council |
| Trove Digital Ireland | |
| Trulife | |
| Trust5 | Dún Laoghaire-Rathdown County Council |
| Trustap Ltd | |