| Dance Ability Movement (The) | Milton |
| Dar Foundation, Food Program | Oakville |
| Darling Home for Kids (The) | Milton |
| Dearcroft Montessori School, Oakville - Dearcroft Trafalgar Crossing, Licensed Child Care Centre | Oakville |
| Dearcroft Montessori School, Oakville - Lakshore Rd E, Licensed Child Care Centre | Oakville |
| Dearcroft Montessori School, Oakville - Rebecca St, Licensed Child Care Centre | Oakville |
| DEEP Basketball, Burlington | Burlington |
| Distress Centre Halton | Halton Region |
| Distress Centres of Greater Toronto, Survivor Support Program | Toronto |
| Dream Kids Clinic and Pediatric Urgent Care | Oakville |
| Drug Free Kids Canada, Parent Support Hub | Ottawa |
| Drury Lane Theatrical Productions | Burlington |
