| Tiny Planet Software Ltd | Ontario |
| tinyAlbert | |
| Tip Top Marketing | Ontario |
| TipS Média | Quebec |
| TIQ Software | Alberta |
| TissueTinker Bio. | |
| Titan Controls and Integration, Inc. | Ontario |
| Titan Creative, Inc. | Ontario |
| Titan Industrial Electronics, Inc. | |
| Titan IT & Video Services Ltd | |
| Titan Maritime | |
| Titan Medical, Inc. | |
| Titan Network Solutions Ltd | Alberta |
| Titan PC's | Ontario |
| Titan Solutions Group, Inc. | |
| TitanFile, Inc. | Ontario |
| Tite Fève | |
| Titus | Ontario |
| Tjene Consulting Company | |
| TJS Technical Services, Inc. | |
| TKMS Group | |
| TKO Computer Services | Nova Scotia |
| TLD Computers, Inc. | British Columbia |
| TLM | Quebec |
| TLT East Ventures | |
| TM design | Quebec |
| TMC IT and Telecom Consulting, Inc. | British Columbia |
| TMC Télécom | Quebec |
| TMISI | Quebec |
| TML Informatique, Inc. | Quebec |
| TMR Communications | Quebec |
| TMX Group Ltd | |
| Tnc the network company | Alberta |
| TNM, Inc. | |
| TNS Smart Network, Inc. | Ontario |
| TNW Networks | British Columbia |
| To Gear Marketing | |
| To-The-TOP | Alberta |
| TOA Canada Corporation | Ontario |
| Toast | |
| TOC.ca | Alberta |
| Tochtech Technologies | |
| TODAQ Holdings, Inc. | |
| Today's Technology Marketing Group | Saskatchewan |
| Todd's Computer Place | Ontario |
| Todigital Technologies | Ontario |
| Toggle Media | Ontario |
| Tokidos, Inc. | |
| Tollé | Quebec |
| Tollé Agence Web | |