| ADAPT Halton, Oakville - Head Office, Alcohol, Drug and Gambling Assessment, Prevention and Treatment Services | Oakville |
| ADAPT Halton, Community Withdrawal Management Services | Halton Region |
| ADAPT Halton, Concurrent Disorders Programs | Halton Region |
| ADAPT Halton, Problem Gambling & Behavioural Addictions Services | Halton Region |
| Canadian Centre on Substance Use and Addiction, Ottawa | Ottawa |
| Centre for Addiction and Mental Health, Addiction Medicine Services and Specialized Clinics | Toronto |
| ConnexOntario, Helpline | London |
| Halton & Mississauga RAAM Clinic, Burlington, Rapid Access Addiction Medicine (RAAM) | Burlington |
| Halton & Mississauga RAAM Clinic, Oakville - Cornwall Rd, Rapid Access Addiction Medicine (RAAM) | Oakville |
| Halton & Mississauga RAAM Clinic, Oakville - Kerr St, Rapid Access Addiction Medicine (RAAM) | Oakville |
| Halton & Mississauga RAAM Clinic, Georgetown, Rapid Access Addiction Medicine (RAAM) | Halton Hills |
| Halton & Mississauga RAAM Clinic, Milton, Rapid Access Addiction Medicine (RAAM) | Milton |
| Halton Healthcare, Mississauga Halton Central Intake Program - one-Link - Addictions and Mental Health Services Referral | Oakville |
| Halton Healthcare, Oakville Trafalgar Memorial Hospital, Mental Health - Integrated Addiction Medicine Clinic | Oakville |
| Halton Healthcare, Oakville Trafalgar Memorial Hospital, Mental Health - Psychotherapy Services for Concurrent Disorders | Oakville |
| Homewood Health Centre | Guelph |
| Hope Place Centres, Men's Residential Addiction Treatment | Halton Hills |
| Hope Place Centres, Community Based Addiction Treatment | Halton Hills |
| Hope Place Centres, Women's Residential Addiction Treatment | Halton Hills |
| Horizons Opioid Treatment Service, Methadone and Suboxone Clinic | Burlington |
| Hospital for Sick Children, Adolescent Medicine | Toronto |
| Milton Life Care, Addiction Services | Milton |
| Native Horizons Treatment Centre | New Credit |
| Ontario Addiction Treatment Centres, Methadone Maintenance Treatment | Oakville |
| PCHS, PCHS Brampton Branch Office, PCHS Brampton | Brampton |
| PCHS, PCHS Mississauga | Mississauga |
| Rapid Addiction Treatment Centre, Medical Treatment and Counselling for Addictions | Clarkson |
| Renascent, Wright Centre | Toronto |
| St. Joseph's Healthcare Hamilton, Men's Addiction Service Hamilton (MASH) | Hamilton |
| St. Joseph's Healthcare Hamilton, Womankind Addiction Service | Hamilton |
| Wellbeings Pain Management and Dependency Clinic | Burlington |
| Women's College Hospital, Substance Use Service | Toronto |
