| The Wireless Age | Saskatchewan |
| The Working Group | Ontario |
| The WyIdeSide | Ontario |
| The YMC | Ontario |
| Théa World | |
| TheAppLabb | Ontario |
| TheCodeFactory | Ontario |
| theComputerClinic | Saskatchewan |
| TheCorridor.ca | Ontario |
| TheExcelAddict.com | Newfoundland and Labrador |
| Themify.me | |
| theMMedia.com | British Columbia |
| ThemPrix | |
| Thentia | |
| Thentia Cloud | |
| Theo Digital Gallery System | Ontario |
| Theory Digital | |
| Theraphage Labs | |
| TherAppX, Inc. | Quebec |
| Theratechnologies, Inc. | Quebec |
| TheRedPin | |
| Therefore | |
| Therefore, Inc. | Ontario |
| Theriotech | |
| Thesecretservice | Ontario |
| TheWebGuy | Manitoba |
| TheWebHosters.Net | Newfoundland and Labrador |
| Thexyz, Inc. | Ontario |
| Think BIG Studios | Saskatchewan |
| Think Communications, Inc. | British Columbia |
| Think Different [LY] Communications | |
| Think Forward Technologies | Ontario |
| Think Global Institute | |
| ThINK Refill | Ontario |
| Think Research Corporation | Ontario |
| Think Tank SEO | |
| Think Tank Training Centre | |
| Think Technology Integrators, Inc. | Manitoba |
| ThinkBasis | Ontario |
| Thinkbound | |
| ThinkCX Technologies, Inc. | |
| ThinkData Works, Inc. | Ontario |
| Thinkific | |
| Thinking BIG Information Technology, Inc. | Prince Edward Island |
| Thinking Cap | Ontario |
| Thinking Capital | Quebec |
| ThinkITSM | Ontario |
| ThinkProfits.com, Inc. | British Columbia |
| ThinkRF.com | Ontario |
| ThinkTech Software, Inc. | |