| Tabernacle Court Apartments | Peterborough |
| Telecare Distress Centre of Peterborough | Peterborough |
| Tender Arms Healthcare Providers | Oshawa |
| The Canadian Canoe Museum, Canadian Canoe Museum | Peterborough |
| The Keene Pumpkin Festival, Keene Pumpkin Festival and Antique Car & Truck Show | Keene |
| The Lighthouse Retreat | Peterborough |
| The Medical Centre, Ontario Breast Screening Program | Peterborough |
| The Mount Community Centre | Peterborough |
| Thrive Housing and Support | Peterborough |
| Thrive Housing and Support, Towerhill Village | Peterborough |
| Total Physiotherapy and Sports Injuries Centre | Peterborough |
| Tourette Canada, Peterborough and Kawartha Lakes Area Contact | Peterborough |
| Trafalgar Addiction Treatment Centre, Gores Landing, Trafalgar East Rehab Centre | Gores Landing |
| Transition Town Peterborough, Mailing Address | Peterborough |
| Trent Lakes Outreach Centre | North Kawartha |
| Trent Lakes. Municipal Office, Fire and Rescue | Trent Lakes |
| Trent Lakes. Municipal Office, Trent Lakes Public Library | Trent Lakes |
| Trent Lakes. Municipal Office | Trent Lakes |
| Trent Regional Sleep Clinic | Peterborough |
| Trent Security Systems Ltd | Peterborough |
| Trent University, Trent Athletics Centre, Nassau Campus - 1650 West Bank Dr | Peterborough |
| Trent Valley Archives | Peterborough |
| Trent Valley Literacy Association, Literacy and Basic Skills | Peterborough |
| Trent-Severn Antique and Classic Boat Club | Peterborough |
| Trenworks Home Services, Oshawa | Oshawa |
