| Toolip | |
| Toornament S.A.S. | |
| Top Achat | Seine-Saint-Denis |
| TOP10 Stratégie | Métropole de Lyon |
| Topaze | Alpes-Maritimes |
| Topbiz.fr | Landes |
| Topizy | |
| Topo Lab | |
| Topo.io | |
| Toporder | |
| TopSolid | Essonne |
| Topsys | Paris |
| Topwize | Hérault |
| Torken | Paris |
| Torop.Net | Haute-Saône |
| Tortoise | |
| TotalEnergies On | |
| TotaLinux | |
| TOTEM | |
| Touaregs | Paris |
| Touch Sensity | |
| Toulouse Biotech Institute | |
| Toulouse Perl Mongers | Haute-Garonne |
| Toulouse School of Economics | |
| Toulouse Space Show | Haute-Garonne |
| Toulouse White Biotechnology | |
| Toursolver | Hauts-de-Seine |
| toutapprendre.com | Paris |
| Trace One | Paris |
| Trace Software International | Seine-Maritime |
| Tracip S.A.S. | Meurthe-et-Moselle |
| TrackAd Group | |
| Trackap S.A.S. | |
| Trackoo | Gironde |
| Trackstone | |
| Tracor Europe S.A.S. | Essonne |
| TradeIn | |
| Trait d'Union | |
| Tralalere | Paris |
| Tran Ha | Paris |
| Trans World Money | Bouches-du-Rhône |
| Transacts Communication | Paris |
| Transalley | |
| Transatel | Hauts-de-Seine |
| TransBar | Loire |
| Transcure Bioservices | |
| Transdata | Moselle |
| Transfert développement informatique | Métropole de Lyon |
| Transfert-fichier | Maine-et-Loire |
| Transgene S.A. | |