| Talbot Creek Community Church, Brechin | Ramara |
| Talk is Free Theatre | Barrie |
| Talk is Free Theatre, Theatre Day Camp | Barrie |
| Tay Hydro, Tay Township | Tay |
| Tay, Township of, Canine Control, Victoria Harbour - Tay Municipal Office | Tay |
| Tay, Township of, Fire Department, Victoria Harbour - Tay Municipal Office | Tay |
| Tay, Township of, No physical address, Rest Stations for Extreme Weather Relief | Tay |
| Tay, Township of, Port McNicoll Library Branch, Public Library, Port McNicoll Branch | Tay |
| Tay, Township of, Port McNicoll, Port McNicoll Community Centre | Tay |
| Tay, Township of, Sports and Recreation Programs, Victoria Harbour - Tay Municipal Office | Tay |
| Tay, Township of, Theo and Elaine Bernard Branch, Victoria Harbour, Public Library, Theo and Elaine Bernard Branch, Victoria Harbour | Tay |
| Tay, Township of, Victoria Harbour, Oakwood Park Community Centre | Tay |
| Tay, Township of, Waubaushene Library Branch, Public Library, Waubaushene Branch | Tay |
| Tay, Township of, Waubaushene, Department of Recreation and Culture - The Benny Club | Tay |
| Tecumseth and West Gwillimbury Historical Society | Bradford West Gwillimbury |
| Teddy Bears Picnic Children's Centre | Clearview (Simcoe County) |
| Telecare Distress Line of Greater Simcoe, Orillia | Orillia |
| Terry Fox Run, Barrie | Barrie |
| Terry Fox Run, Tudhope Park 2023, Terry Fox Run - Orillia | Orillia |
| Tetra Society of North America, Mailing Address, Northern Ontario Chapter | Oro-Medonte |
| Thalidomide Victims Association of Canada | Montréal |
| The common roof, Barrie | Barrie |
| The common roof, Orillia | Orillia |
| The Corporation of First Baptist Church, Barrie, Barrie | Barrie |
| The Friends of Awenda Park, Friends of Awenda Park | Tiny |
| The Georgian Cycle & Ski Trail Association | Collingwood |
| The Good Latch | Barrie |
| The Karma Project Community Food Co-operative, Seed Youth Program | Port McNicoll |
| The Kinder Garden Children's Centre for Excellence and Early Education | Essa |
| The LearningHUB, Online/Web | North Huron |
| The Lighthouse, Community Services, Orillia | |
| The Lighthouse, Orillia, Emergency Shelter and Warming Centre | |
| The Lighthouse, Supportive Housing, Orillia | Orillia |
| The Living Wish Foundation, No physical location | Wasaga Beach |
| The Rainbow Club of South Georgian Bay, Collingwood | Collingwood |
| The Sharing Place Food Centre, Food Hamper Program, Orillia | Orillia |
| The Sharing Place Food Centre, The Sharing Place Food Bank, Orillia | Orillia |
| The Ship's Company of Penetanguishene | Penetanguishene |
| The Stride Clinic, Barrie | Barrie |
| The Stride Clinic | Orillia |
| The Terry Fox Run in the Heart of Georgian Bay | Midland |
| 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 |
| Theatre Collingwood | Collingwood |
| Therapeutic Paws of Canada, Mailing Address | Barrie |
| Think Feet - Family Foot Clinic | Orillia |
| Third Age Barrie Lifelong Learning Association, Mailing Address | Barrie |
| Thornton Community Food Bank | Essa |
| Three Links Cooperative Housing (Barrie), Barrie, Three Links Cooperative Housing | Barrie |
| Tim Orser's Lift Service | Orillia |
| Timothy Christian School | Barrie |
| Tiny Hoppers Barrie, Barrie - Big Bay Point Rd, Childcare Centre | Barrie |
| Tiny Township Lions Club | Tiny |
| Tiny, Township of | Midland |
| Tiny, Township of, 342 Lafontaine St W, Lafontaine Community Centre | Tiny |
| Tiny, Township of, 817 County Rd 6 S, Emergency Services Department | Tiny |
| Tiny, Township of, 91 Concession Rd 8 E, Recreation Department - Township of Tiny Community Centre | Tiny |
| Tiny, Township of, Balm Beach, Mobi-mat Accessible Beach | Balm Beach |
| Tiny, Township of, Municipal Office | Tiny |
| Tiny, Township of, Municipal Office, Recreation & Community | Tiny |
| Tiny-Shiny Childcare | Clearview (Simcoe County) |
| Toastmasters, Grey, Bruce and Collingwood | Grey County |
| Tollendale Village | Barrie |
| Toothpicks, Mobile Service | Springwater |
| TOPS, Alcona | Alcona |
| TOPS | Essa |
| TOPS, Orillia | Orillia |
| TOPS, Stayner | |
| TOPS. Barrie | Barrie |
| Toronto Abortion Clinic (The) | Toronto Downtown North |
| 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 |
| Towhee Residential Summer Program | Haliburton |
| Town Chiropractic, Coldwater, Chiropractic Service, Coldwater | Severn |
| Town Chiropractic, Orillia, Chiropractic Service, Orillia | Orillia |
| 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 |
| Township of Severn, Building Department. Planning and Development, Orillia | Severn |
| Township of Severn, Coldwater, Severn Township Public Library | Severn |
| Township of Severn, Fire and Emergency Services, Orillia | Severn |
| Township of Severn, Municipal Law Enforcement. Planning and Development, Orillia | Severn |
| Township of Severn, No physical address, Rest Stations for Extreme Weather Relief | Severn |
| Township of Severn, Orillia, Administration Office | Severn |
| Township of Severn, Planning Department, Orillia | Severn |
| Township of Severn, Recreation and Culture Advisory Committee, Orillia | Severn |
| Township of Severn, The Public Works and Utilities Department, Orillia | Severn |
| Township of Severn, Washago Community Centre | Severn |
| Toys for Kids - Wasaga Beach | Wasaga Beach |
| Tracks Employment and Resource Services of Georgian Bay | Collingwood |
| Tracks Employment and Resource Services of Georgian Bay, Collingwood, Integrated Employment Services | Collingwood |
| Tracks Employment and Resource Services of Georgian Bay, Opportunities, Collingwood | Collingwood |
| Training for Life, Collingwood - No Physical Address | Collingwood |
| TransUnion of Canada, Burlington, Consumer Relations | Burlington |
| Trauma and Life Stress Reduction | Barrie |
| Treasured Kids School | Oro-Medonte |
| Trinity Anglican Church, Barrie | Barrie |
| Trinity Anglican Church, Barrie, Trinity Hill Top Day Camp | Barrie |
| Trinity Anglican Church, Bradford | Bradford West Gwillimbury |
| Trinity United Church, Collingwood, Food Pantry | Collingwood |
| Trinity United Church, Collingwood, Susan Wells Memorial Crock Pot Cooking Program | Collingwood |
| Trinity United Church, Collingwood | Collingwood |
| Triple P Positive Parenting Program Network in Simcoe County and Muskoka | Barrie |
| Trish Hartman, Doula | Tiny |
| Trout Creek Lions Club | |
| True North Christian Academy | Clearview (Simcoe County) |
| Tuberous Sclerosis Canada Sclérose Tubéreuse | Barrie |
| Turf King Georgian Triangle | Wasaga Beach |
| Turning Point Counselling | Collingwood |
| TVO ILC | Toronto |
| TVO ILC, TVO Mathify | Toronto |