| Tauria | Ontario |
| TAV College | |
| Tavanca | British Columbia |
| TaxFreeway | Ontario |
| TaxTron, Inc. | Ontario |
| Taylor + Wolfe Marketing | |
| Taylor Corporation | Alberta |
| Taylor Electronic Designs | Ontario |
| Taylor Electronic Services, Inc. | Ontario |
| TaylorWarwick Consulting Ltd | Alberta |
| Tayson.com | Ontario |
| TB Media | |
| TBayIT | Ontario |
| Tbaytel | Ontario |
| TBC Computers | Nova Scotia |
| TBD Telecom By Design, Inc. | Ontario |
| TBK Creative | Ontario |
| TBL Telecom | Quebec |
| TBS Software, Inc. | Ontario |
| TCA Technologies, Inc. | |
| Tcl Developer Xchange | British Columbia |
| TCM Financial Studio | |
| TCp Cable | |
| TCP Global Solutions | Ontario |
| TCP Network Services | Ontario |
| TCPCOM, Inc. | Quebec |
| TCS Canada | Ontario |
| TCS Developments, Inc. | British Columbia |
| TCS Forensics Ltd | British Columbia |
| TCSI Consulting Ltd | British Columbia |
| TD Securities | |
| TD Synnex Canada ULC | |
| TDF Company | |
| TDG Informatique | |
| TDG Marketing | |
| TDN Pro | Quebec |
| TDTSolutions | Prince Edward Island |
| Tea-Security | Quebec |
| TeachOnline | |
| TealBook | |
| Tealbook, Inc. | Ontario |
| Team Fish Monitoring, Inc. | |
| Team Marketing | Quebec |
| Team Meta Information Systems, Inc. | British Columbia |
| Team Remote ASP Debugger | Quebec |
| Team Zero Studio Ltd | |
| TeamGram | |
| Teamsoft, Inc. | Quebec |
| TeamWise | |
| Teamy Pumpkin | |