| Tridek-One | |
| Trigone | |
| Trikaya | Jura |
| Trimane | |
| TroisPointZéro | |
| Trombino Suite | Paris |
| TRONICO | Vendée |
| Troopers | |
| Troops | |
| Tropee | |
| TRSb | Paris |
| Truffle 100 | Paris |
| Truffle Capital | Paris |
| Trust Telecom | Bouches-du-Rhône |
| TRUSTED SHOPS France S.A.R.L. | Nord |
| Trustpair | |
| Tryane.com | Paris |
| TSE, énergie de confiance | |
| TSplus | |
| Tsuga Data | |
| Tudigo | |
| Tuesday | |
| Tuleap | Isère |
| Turenne Capital Parternaires | |
| Turnover-IT | Paris |
| Tuto | Var |
| Tuto.com | Var |
| Tux-Logic | Bouches-du-Rhône |
| TuxFamily | Paris |
| TVH Consulting | Yvelines |
| TVM Technologie | Hauts-de-Seine |
| TVPaint | Moselle |
| TwicPics S.A.S. | |
| Twin | |
| Twinin | |
| TWINPIX | |
| TwinswHeel | |
| TXCube | |
| TYLIA Invest S.A.S. | |
| Tyms S.A.S. | |
| Typofonderie | Hauts-de-Seine |
| TYREX | |
| Tysep | Haute-Savoie |
| U-Space | |
| UAVIA | |
| Ubble | Paris |
| UBG | |
| Ubiant | |
| UBIKA | |
| Ubiq | |