| Name | Region |
|---|---|
| Themis S.r.l. | |
| Thenet S.r.l. | Naples |
| Theorema Electronics S.n.c. | Friuli-Venezia Giulia |
| Thesislab S.r.l. | Caserta |
| theTconcept | Turin |
| Thin Film Equipment S.r.l. | Milan |
| Things S.r.l. | Milan |
| ThinkFor | Milan |
| ThinkIN | Trento |
| ThinkLegal S.r.l. | |
| ThinkQuantum S.r.l. | Vicenza |
| This Unique | Milan |
| TIASSISTO24 S.r.l. | |
| Tiberweb S.a.s. | Viterbo |
| Ticketoo | |
| Tideup S.r.l. | Genoa |
| Tiesse Robot S.p.A. | Brescia |
| Tiledesk S.r.l. | |
| TIM S.p.A. | |
| TimeFlow | Lecce |
| Tinalp | Milan |
| Tinet S.r.l. | Treviso |
| Tinexta S.p.A. | |
| Tinfo S.r.l. | Forlì-Cesena |
| Tips S.r.l. | Teramo |
| Titan4 S.r.l. | |
| TMLAB S.r.l. | |
| TNX S.r.l. | Siena |
| Tommstudio | Como |
| Top Consult S.r.l. | Turin |
| Top Service S.r.l. | Bari |
| Top Trade | Milan |
| TOP-IX | Turin |
| TopNetwork S.p.A. | |
| Torcha S.r.l. | Milan |
| Torinoweb | Turin |
| Toso.NET | Prato |
| Totally Innovation | |
| Totofortuna | Rome |
| Touch and Contact S.r.l. | |
| Touch Multimedia S.r.l. | Vicenza |
| Tourtools S.r.l. | Perugia |
| Tower Technologies S.r.l. | Turin |
| Tpa S.r.l. | |
| TR-system S.r.l. | Parma |
| Tradenet.it | Vicenza |
| Trainect S.r.l. | Rome |
| Training 4U S.r.l. | |
| Tramezzani S.r.l. | Varese |
| TRANS-TECH |