| Talk is Free Theatre | Barrie |
| Tarion Warranty Corporation, Ontario New Home Warranty Program | Toronto Downtown |
| Tecumseth and West Gwillimbury Historical Society | Bradford West Gwillimbury |
| Tetra Society of North America, Mailing Address, Northern Ontario Chapter | Oro-Medonte |
| The Blueberry Place | Tay |
| The common roof, Barrie | Barrie |
| The Elden of Bradford | Bradford |
| The Good Latch | Barrie |
| The Kinder Garden Children's Centre for Excellence and Early Education | Essa |
| The Lighthouse, Community Services, Orillia | |
| The Lighthouse, Orillia, Emergency Shelter and Warming Centre | |
| The Well Community Chapel | New Tecumseth |
| Theatre by the Bay, Barrie Theatre Lab | Barrie |
| Theatre by the Bay | Barrie |
| Theatre Collingwood, March Break Drama Program | Collingwood |
| Thornton Community Food Bank | Essa |
| Ticket Agencies | Barrie |
| Timothy Christian School | Barrie |
| TOPS, Alcona | Alcona |
| TOPS | Essa |
| TOPS, Orillia | Orillia |
| TOPS, Stayner | |
| TOPS. Barrie | Barrie |
| Tottenham and Area Holiday Hamper | New Tecumseth |
| Tottenham Co-Op Preschool | New Tecumseth |
| Tottenham United Church | New Tecumseth |
| Tourism Barrie | Barrie |
| Tourism Simcoe County, No Physical Address, Simcoe County Farm Fresh | Simcoe |
| Towards Recovery Clinic, Barrie, Towards Recovery Clinic, Barrie | Barrie |
| Town of Innisfil, Innisfil ideaLAB & Library - Cookstown Branch, Troy Scott Community Fridge | Innisfil |
| Town of Innisfil, Innisfil ideaLAB & Library - Lakeshore Branch, Troy Scott Community Fridge | Innisfil |
| Town of Innisfil, Innisfil Recreational Centre, Troy Scott Community Fridge | Innisfil |
| Town of Innisfil, Town Hall, Innisfil Municipal Office | Innisfil |
| Town of Innisfil, Town Hall, Recreation Programs and Summer Day Camps | Innisfil |
| TransUnion of Canada, Burlington, Consumer Relations | Burlington |
| Trinity Anglican Church, Bradford | Bradford West Gwillimbury |
| Trinity United Church, Collingwood | Collingwood |
| Triple P Positive Parenting Program Network in Simcoe County and Muskoka | Barrie |
| Tuberous Sclerosis Canada Sclérose Tubéreuse | Barrie |
| TVO ILC | Toronto |