| ADAPT Halton, Oakville - Head Office, Alcohol, Drug and Gambling Assessment, Prevention and Treatment Services | Oakville |
| ADAPT Halton, Community Justice Programs | Halton Region |
| ADAPT Halton, Concurrent Disorders Programs | Halton Region |
| ADAPT Halton, Youth Programs | Halton Region |
| Addiction Services Central Ontario, Aurora Main Office, Remote Single Session Counselling | Aurora |
| Associated Youth Services of Peel | Mississauga |
| Halton & Mississauga RAAM Clinic, Oakville - Head Office, Addiction Medicine Clinic | Oakville |
| Halton & Mississauga RAAM Clinic, Acton, Addiction Medicine Clinic | Halton Hills |
| Halton & Mississauga RAAM Clinic, Burlington, Addiction Medicine Clinic | Burlington |
| Halton & Mississauga RAAM Clinic, Georgetown, Addiction Medicine Clinic | Halton Hills |
| Halton & Mississauga RAAM Clinic, Milton, Addiction Medicine Clinic | Milton |
| Halton & Mississauga RAAM Clinic, Oakville - 1525 Cornwall Rd, Addiction Medicine Clinic | Oakville |
| Halton & Mississauga RAAM Clinic, Oakville - Kerr St, Addiction Medicine Clinic | Oakville |
| Halton Healthcare, Oakville Trafalgar Memorial Hospital, Mental Health - Integrated Addiction Medicine Clinic | Oakville |
| Hope Place Centres, Community Based Addiction Treatment | Halton Hills |
| Horizons Opioid Treatment Service, Methadone and Suboxone Clinic | Burlington |
| Métis Nation of Ontario, Brampton | Brampton |
| Native Horizons Treatment Centre | New Credit |
| Ontario Addiction Treatment Centres, Methadone Maintenance Treatment | Oakville |
| PCHS, PCHS Brampton | Brampton |
| PCHS, PCHS Mississauga | Mississauga |
| Rapid Addiction Treatment Centre, Medical Treatment and Counselling for Addictions | Clarkson |
| South Asian Canadians Health and Social Services, SACHSS Mental Health Services | Brampton |
| Wellbeings Pain Management and Dependency Clinic | Burlington |
| William Osler Health System, Peel Memorial Centre for Integrated Health and Wellness | Brampton |
| Women's College Hospital, Substance Use Service | Toronto |
