| Trinity Biotech plc | |
| Trinity College Dublin - LaunchBox, Tangent’s Student Accelerator | |
| 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 |
| Trulife | |
| Trust5 | Dún Laoghaire-Rathdown County Council |
| Trustap Ltd | |
| trustMinder | |
| Tryfit Technologies Holding Company | |
| TSG Ltd | Cork City Council |
| Tucr.io | |
| Tyndall National Institute | Cork City Council |
| UBIPIX | |
| UBiqube | |
| Ubotica Technologies Ltd | |
| UCD Innovation Academy | |
| Ultimate Websites | |
| Unified Technology | Dublin City Council |
| Unipos Systems Ltd | Fingal County Council |
| Unique Communications | Dublin City Council |
| United Drug | |
| University College Cork | Cork City Council |
| University College Cork - School of Computer Science and Information Technology | Cork City Council |
| University College Dublin | Dublin City Council |
| University College Dublin - School of Agriculture and Food Science | Dublin City Council |
| University College Dublin - School of Computer | Dún Laoghaire-Rathdown County Council |
| University College Dublin - School of Mathematics and Statistics | Dún Laoghaire-Rathdown County Council |
| University of College Cork - School of Mathematical Sciences | Cork City Council |
| University of Limerick | Limerick City and County Council |
| University of Limerick - Electronic and Computer Engineering | Limerick City and County Council |
| Upskillist Group Ltd | |
| UpThink Innovation Agency | |
| UrbanFox | |
| Urbanvolt | |
| USL Technologies | Louth County Council |
| UWS Ltd | Dublin City Council |
| V-Interactive | Waterford City and County Council |
| Val-PM Solutions Ltd | |
| Valid8me | |
| ValitaCell Ltd | |
| Vantage Resources | Dún Laoghaire-Rathdown County Council |
| Vaultree | |
| Vela Games | |
| Vennetics | |
| VentureWave Capital Ltd | |
| Version 1 | |
| Viatec Business Solutions Ltd | Dublin City Council |