| TP Teltech Sp. z o.o. | Łódź |
| TPnets | Łódź |
| Tradex Systems Sp. z o.o. | Masovian |
| Transactionlink | |
| Transbit Sp. z o.o. | Masovian |
| Transition Technologies PSC | |
| Transnet | Pomeranian |
| TransparentData | Greater Poland |
| Transrem Sp. z o.o. | |
| Travelplanet.pl S.A. | |
| TravelTECH | |
| TravelTECH Sp. z o.o. | |
| TrawkaStudio | Masovian |
| Treative Sp. z o.o. | Lesser Poland |
| Trefix | |
| Tres Centrum Oprogramowania | Pomeranian |
| Tricomp Sp. z.o.o. | Masovian |
| TRIGER Sp. z o.o. | Masovian |
| TriSoft Systemy Informatyczne Sp. z o.o. | |
| TRon | Lower Silesian |
| Tronix | Masovian |
| Troubleshooter.pl | Lower Silesian |
| Trout.pl | Lesser Poland |
| Trustee | Łódź |
| TRX | Masovian |
| TS Software | Greater Poland |
| TS2 Space | Masovian |
| TTS Company | Masovian |
| Turck | Opole |
| Tut.pl | Masovian |
| Tutlo | |
| Twin Points Technologies | Kuyavian-Pomeranian |
| Twój Startup | |
| TYMIQ | |
| Typly | |
| T‑Mobile Polska S.A. | Masovian |
| Uczelnia Jana Wyżykowskiego | Lower Silesian |
| Uczelnia Korczaka | |
| Uczelnia Nauk Społecznych | |
| Uczelnia Techniczno-Handlowa im. Heleny Chodkowskiej | Masovian |
| Uczelnia Warszawską im. Marii Skłodowskiej-Curie | Masovian |
| Uczelnia Łazarskiego w Warszawie | Masovian |
| Ugu.pl | Greater Poland |
| UIG Studio | |
| UkrainianDevs Co. | Lublin |
| Ulam Labs | Lower Silesian |
| ULAM Tech | Lubusz |
| Ulam.ai | |
| Ulan Software | Lower Silesian |
| Ulisses Sp. z o.o. | Greater Poland |