| Thecon | |
| TheGravity | |
| Themeisle | |
| Themesberg | |
| There's An AI For That S.R.L. | |
| Thinkdigital | Bucharest |
| ThinkOut | Iași |
| Thinslices | |
| Thor Panel | Bucharest |
| Threeangle Software Solutions S.R.L. | |
| Tiberiu Popoviciu Institute of Numerical Analysis, Romanian Academy | |
| Timișoara Startups | Timiș |
| TMZ Software S.R.L. | |
| TNT Computers S.R.L. | |
| Today's Search Engine Marketing | Bucharest |
| Toko | Bucharest |
| TokTech Web Technologies | |
| Tomax WEB | |
| Top Edge Engineering | Dolj |
| TopTech | Hunedoara |
| Toptech Projects S.R.L. | |
| Tornado Technology | Bucharest |
| Total IT | Bucharest |
| TotalSoft | Bucharest |
| Touch Media | |
| Toud | Bucharest |
| TPC Management | |
| TradeVille | |
| Transart | Cluj |
| Transycons | Cluj |
| Travelio | |
| Treeworks | Bucharest |
| Tremend | Bucharest |
| Trendix | Dolj |
| Tribal Worldwide Romania | |
| Trieurodata | |
| Trustdesign | |
| TrustEthics | |
| Tryamm | Bucharest |
| TudorCommunications | |
| Tuio Social Media S.R.L. | |
| Turbo Web International S.R.L. | |
| TUYA Digital | |
| TVL Technology | |
| Twilio | |
| Tyit S.R.L. | Timiș |
| Ultimate Systems | Timiș |
| Unchain Festival | |
| Undelucram | |
| Underweb | |