| TaxMachine | Silesian |
| TBD MAZOWSZE Sp. z o.o. | Masovian |
| TDCM.io | |
| TDJ Pitango Ventures | |
| TDSOFT | Łódź |
| TeaCode | |
| Team Connect Sp. z o.o. | |
| TEAM S.C. | Greater Poland |
| Teamnet | West Pomeranian |
| Tebim Sp. z o.o. | |
| TeBIT | Lower Silesian |
| Tech Data Polska Sp.z.o.o. | |
| Tech to the Rescue Foundation | |
| Tech3camp | |
| TECHBASE Group Sp. z o.o. | Pomeranian |
| Techcloud Sp. z o.o. | |
| Techland S.A. | |
| TechMac | Masovian |
| Techmo | |
| Technetium | Subcarpathian |
| Techniserv Sp. z o.o. | Silesian |
| Technokabel S.A. | |
| Technologie Internetowe S.A. | Masovian |
| Technology Accelerator Gliwice ASI Sp. z o.o. | |
| Technology Partners | |
| Technopark Pomerania | West Pomeranian |
| Techpol-System | |
| TechRecruiters | |
| Techs | |
| Techsource Sp. z o.o. | |
| Techstack | |
| TechVigo | Masovian |
| Techvoip | Greater Poland |
| TechWings | |
| Tecra Space | |
| teems.it | |
| Tekom Technologia | Masovian |
| Tel-Ster Sp. z o.o. | |
| Telbit | Pomeranian |
| Telbud S.A. | Greater Poland |
| Teldat | |
| Teleaudio Diwa Sp. z o.o. Sp.k. | Masovian |
| Telecom Consulting | Masovian |
| Telekom | Silesian |
| Telekom Warmia Sp. z o.o. | Warmian-Masurian |
| Telekomfort | Silesian |
| Telemedi | |
| TelePolska Sp. z o.o. | Masovian |
| Telestrada | Masovian |
| Teletronic | Lesser Poland |