| | Organization Name(s) | Located In |
 | T A Patterson and Associates Incorporated, GRIP Alcohol and Drug Awareness Program | Hamilton Central |
| T A Patterson and Associates Incorporated, Paradigm | Hamilton Central |
| T A Patterson and Associates Incorporated, Perspectives | Hamilton Central |
| Tai Chi on Locke | Hamilton West |
| | Take Back the Night | Hamilton Central |
| | Take Off Pounds Sensibly, Hamilton Area Locations | Hamilton (City of) |
| | Talka Lithuanian Credit Union Ltd | Hamilton East |
| Tamahac Club | Ancaster |
| Taoist Tai Chi Society of Canada, Dundas Location | Dundas |
| Taoist Tai Chi Society of Canada, Hamilton Location | Hamilton Mountain West |
| Tapawingo Day Care Centre | Hamilton Mountain Central |
| Tapleytown United Church, Tapleytown Pastoral Charge | Stoney Creek |
| Tapply-Binet College | Ancaster |
| Tarion Warranty Corporation | Toronto |
| Teamsters Retirees | Hamilton East |
| | Telecare Burlington Distress Line | Burlington |
| Temple Anshe Sholom | Hamilton West |
| Temple Anshe Sholom, Religious School | Hamilton West |
| Temple Playhouse Enrichment School Inc | Hamilton West |
| Terry Fox Foundation (The), Ontario Office | Toronto |
| | Tetra Society of North America, Hamilton Chapter | Hamilton (City of) |
| The Factory: Hamilton Media Arts Centre | Hamilton Central |
| The Print Studio | Hamilton Central |
| Theatre Ancaster | Ancaster |
| Theatre Ancaster, Day Camp Programs | Ancaster |
| Theatre Aquarius, Dofasco Centre for the Arts | Hamilton Central |
| Theatre Aquarius, Dofasco Centre for the Arts, Theatre Aquarius Summer School | Hamilton Central |
| Theatre Aquarius, Performing Arts Programme, Day Camp Programs | Hamilton Central |
| Theological College of the Canadian Reformed Churches | Hamilton Mountain West |
| Therapy Health Care Inc | Burlington |
| Therapy Specialties | Brantford |
| | Thesaurus Club | Ancaster |
| Think Food Phones for Food Project | Etobicoke |
| Threshold School of Building | Hamilton Central |
| | Tim Horton Childrens Foundation | |
| Timothy Canadian Reformed School | Hamilton Mountain East |
| Toastmasters International, 1st Waterdown Club | Waterdown |
| Toastmasters International, Ambitious City Toastmasters Club #1586 | Hamilton West |
| Toastmasters International, Midday Marauders Toastmaster Club | Hamilton Central |
| Toastmasters International, The Valley Town Toastmaster Club of Dundas / Ancaster | Dundas |
| Todays Family - Early Learning and Child Care | Hamilton Mountain West |
| Todays Family - Early Learning and Child Care, Adventure Camp - Delta United | Hamilton East - Central Section |
| Todays Family - Early Learning and Child Care, Dundas Centre | Dundas |
| Todays Family - Early Learning and Child Care, Eastmount Park Centre | Hamilton Mountain East |
| Todays Family - Early Learning and Child Care, Hamilton Centre | Hamilton Mountain West |
| Todays Family - Early Learning and Child Care, Huntington Park Before and After School Program | Hamilton Mountain East |
| | Todays Family - Early Learning and Child Care, Licensed Home Program | Hamilton (City of) |
| Todays Family - Early Learning and Child Care, Linden Park Centre | Hamilton Mountain Central |
| Todays Family - Early Learning and Child Care, Nanny Referral Service | Hamilton Mountain West |
| Todays Family - Early Learning and Child Care, R A Riddell School Age Program | Hamilton Mountain West |
| Todays Family - Early Learning and Child Care, Saltfleet Centre | Stoney Creek - Upper |
| Toronto Blue Jays Baseball Club, Ticket Information | Toronto |
| | Toronto Convention and Visitors Association / Tourism Toronto | Toronto |
| | Toronto. Public Health, Acquired Immune Deficiency Syndrome and Sexual Health Infoline | Toronto |
| | Toshiba of Canada, Toshiba Environmental Recycling and Recovery Effort | Markham |
| Tourette Syndrome Foundation of Canada | Mississauga |
| Tourette Syndrome Foundation of Canada, Hamilton, Halton and Niagara Region Chapter | Burlington |
| | Tower Poetry Society (THE) | Hamilton West |
| Townsview Lifecare Centre | Hamilton Central |
| | Traditional Healing Program | Hamilton (City of) |
| Transfiguration Lutheran Church | Hamilton Mountain East |
| Transportation For Liveable Communities (TLC) | Hamilton - Lower City |
| Transway Girls Basketball Camp, Day Camp Programs | Hamilton West |
| Travel Doctor (The) | Hamilton Central |
| Tree Canada | Ottawa |
| Trillium Childhood Cancer Support Centre (The) | Hamilton Mountain East |
| Trillium Childhood Cancer Support Centre (The), Camp Trillium, Day Camp Programs, Hamilton Location | Hamilton West |
| | Trillium Childhood Cancer Support Centre (The), Camp Trillium, Residential Camp Programs, OuR Island | |
| Trillium Childhood Cancer Support Centre (The), Camp Trillium, Residential Camp Programs, Rainbow Lake | Waterford |
| Trillium Gift of Life Network | Toronto |
| Trinacrian Sports Club | Hamilton Central |
| | Trinidad and Tobago Association of Hamilton | Hamilton Mountain Central |
| Trinity Presbyterian Church | Hamilton Mountain East |
| Trinity United Church | Hamilton Mountain East |
| TrueCity - Churches Together for the Good of the City | Hamilton Central |
| Turning Points | Dundas |
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