| Tomorrow Sp. z o.o. | |
| Toolbox for HR | |
| Tooploox Sp. z o.o. | |
| Top Position | Silesian |
| Top2net Sp. z o.o. | Lower Silesian |
| Topological Methods in Nonlinear Analysis | Kuyavian-Pomeranian |
| Topus | Lower Silesian |
| Toro Performance | |
| Torquemada Games | |
| Toucan Systems | |
| TouK Sp. z o.o. s.k.a. | |
| TP Teltech Sp. z o.o. | Łódź |
| TPnets | Łódź |
| Tradex Systems Sp. z o.o. | Masovian |
| Transactionlink | |
| Transbit Sp. z o.o. | Masovian |
| Transform Agency | |
| Transition Technologies PSC | |
| Transnet | Pomeranian |
| TransparentData | Greater Poland |
| Transrem Sp. z o.o. | |
| Trasti | |
| Travelplanet.pl S.A. | |
| TravelTECH | |
| TravelTECH Sp. z o.o. | |
| TrawkaStudio | Masovian |
| Treative Sp. z o.o. | Lesser Poland |
| Treative Sp. z o.o. | |
| Tree Solutions | |
| Trefix | |
| Tres Centrum Oprogramowania | Pomeranian |
| Tricomp Sp. z.o.o. | Masovian |
| TRIGER Sp. z o.o. | Masovian |
| Trineo Sp. z o.o. | |
| TriSoft Systemy Informatyczne Sp. z o.o. | |
| TRon | Lower Silesian |
| Tronel Sp. z o.o. | |
| Tronix | Masovian |
| Troubleshooter.pl | Lower Silesian |
| Trout.pl | Lesser Poland |
| TruetoWeb | |
| Trui | |
| Trustee | Łódź |
| TRX | Masovian |
| TS Software | Greater Poland |
| TS2 Space | Masovian |
| TTcomm Sp. z o.o. | |
| TTS Company | Masovian |
| Turbo IT Sp. z o.o. | |
| Turck | Opole |