| Dance Ability Movement (The) | Milton |
| Dar Foundation, Food Program | Oakville |
| Darling Home for Kids | Milton |
| Dearcroft Montessori School, Oakville - Dearcroft Trafalgar Crossing, Licensed Child Care Centre | North Oakville |
| Dearcroft Montessori School, Oakville - Lakshore Rd E, Licensed Child Care Centre | Old Oakville |
| Dearcroft Montessori School, Oakville - Rebecca St, Licensed Child Care Centre | Oakville |
| Diabetes Canada, D-Camps Ontario | Huntsville |
| Distress Centre Halton | Oakville |
| Distress Centres of Greater Toronto, Survivor Support Program | Toronto |
| Dream Kids Clinic and Pediatric Urgent Care | Oakville |
| Drury Lane Theatrical Productions | Burlington |
