| TELUS Health MyCare | Toronto Centre-ville Centre |
| Ten Oaks Project, Ottawa | Ottawa |
| Their Opportunity | Ottawa |
| Thompson Square Medical Centre | Milton |
| Thompson Square Pharmacy | Milton |
| Thompson Walk-In and Medical Clinic | Milton |
| Timbres de Pâques | Toronto Centre-ville Nord |
| Total Health Pharmacy, Milton - Avenue Laurier, Services pharmaceutiques | Milton |
| Total Health Pharmacy, Oakville - Boulevard Oak Park, Services Pharmaceutiques | Oakville |
| Total Health Pharmacy, Oakville - Nottinghill Gate, Services pharmaceutiques | Oakville |
| Total Health Pharmacy, Oakville - Chemin Morden, Services pharmaceutiques | Oakville |
| Tourette Canada | Brampton |
| Trafalgar Pharmacy, Services Pharmaceutiques | Oakville |
| Trans Lifeline | |
| TransUnion of Canada, Burlington | Burlington |
| Tribunal de la sécurité sociale du Canada | Ottawa |
| Tribunal de l'aide sociale | Toronto |
| Tribunal de l'éducation spécialisée de l'Ontario | Toronto |
| Tribunal des droits de la personne de l'Ontario | Toronto |
| Tribunaux décisionnels Ontario | Toronto |
| Trio Medical Centre | Milton |
| True North Imaging, Oakville, Services de l'imagerie diagnostique | Oakville |
| TrueCare Medical Centre | Milton |
| TrueCare Pharmacy, Services Pharmaceutiques | Milton |
| Tuberous Sclerosis Canada Sclérose Tubéreuse | Barrie |
| TVO ILC | Toronto |
