| Tuango | Quebec |
| Tucker Solutions | |
| Tuckersmith Communications Co-operative | Ontario |
| Tucows | |
| Tudio | |
| Tuff Media | |
| Tugboat Group | British Columbia |
| Tulip.io, Inc. | Ontario |
| Tumblewire | Ontario |
| Tumbling Wave Software | Newfoundland and Labrador |
| Tundra Process Solutions Ltd | |
| Tungsten Automation | |
| Tungsten Collaborative | |
| TunnelBear | Ontario |
| Tuq | |
| Turbopub | Quebec |
| Turbulences | Quebec |
| Turbulent | Quebec |
| Turko | Quebec |
| Turn Up Technologies, Inc. | |
| Turnford Systems, Inc. | Ontario |
| TurnitOn | Ontario |
| Turnkey Web Solutions | Ontario |
| Turnstone Biologics | |
| Turris Communications | Ontario |
| Turtle Design, Inc. | |
| Turtle Island Technology Solutions | |
| Turtle Technologies, Inc. | Ontario |
| Tusk Automation, Inc. | British Columbia |
| Tuttarvik, Inc. | Nunavut |
| Tuun Creative Studio | |
| TuxInformatique | |
| Tuxxedo Studios | Quebec |
| TV Repair Centre | |
| TVC Communications Canada | Ontario |
| Tveon | |
| TVL, Inc. | British Columbia |
| Tweaked SEM | |
| Tweaked SEO | |
| TweepsMap | Ontario |
| TwelveDot, Inc. | Ontario |
| Twelverays | |
| Twilight Games | Quebec |
| TwinBytes, Inc. | Ontario |
| Twirling Umbrellas Ltd | British Columbia |
| Twirp Communications, Inc. | Nova Scotia |
| Twisted Oak Studios | Nova Scotia |
| Twisted Pairs IT Solutions Ltd | Alberta |
| TwistedWave Software Ltd | British Columbia |
| TWM Compu Age | Ontario |