| 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 |
| Al-Anon Family Groups, Halton Hills and Milton, Al-Anon and Alateen Meetings | Halton Hills |
| Al-Anon Family Groups, Hamilton / Burlington, Al-Anon / Alateen Meetings | Burlington |
| Al-Anon Family Groups, Oakville, Al-Anon / Alateen Meetings | Oakville |
| Alcoholics Anonymous, Oakville - Halton District Office, Halton Area Meetings | Halton Region |
| Alcoholics Anonymous - North Halton/Erin, North Halton / Erin District, Erin and Area Meetings | Erin |
| Alcoholics Anonymous (GTA), Find an Alcoholics Anonymous Meeting - Greater Toronto Area Intergroup | Ontario |
| Alcoholics Anonymous Hamilton, Alcoholics Anonymous Meetings | |
| Canadian Cancer Society - Ontario Division, Smokers' Helpline | Toronto Downtown North |
| Centre for Addiction and Mental Health, Addiction Medicine Services and Specialized Clinics | Toronto |
| Centre for Addiction and Mental Health, INTREPID Lab | Toronto |
| Cocaine Anonymous | Toronto Downtown Central |
| ConnexOntario, Helpline | London |
| Debtors Anonymous, Oakville - Mailing Address | Oakville |
| Gamblers Anonymous, Compulsive Gambling Support Services | Vaughan |
| Grenfell Ministries, National Overdose Response Service | Hamilton |
| Halton & Mississauga RAAM Clinic, Oakville - Head Office, Rapid Access Addiction Medicine (RAAM) | 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, 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 |
| Homewood Health Centre | Guelph |
| Hope Bible Church Oakville, Recovery Group | Oakville |
| Hope Place Centres, Men's Bed-Based Addiction Treatment Program | Hornby |
| Hope Place Centres, Community Based Addiction Treatment | Halton Hills |
| Hope Place Centres, Women's Bed-Based Addiction Treatment Program | Halton Hills |
| Horizons Opioid Treatment Service, Methadone and Suboxone Clinic | Burlington |
| Métis Nation of Ontario, Brampton | Brampton |
| Milton Life Care, Addiction Services | Milton |
| Moderation Management | Ontario |
| Nar-Anon Family Groups, Halton Meetings | Halton Region |
| Narcotics Anonymous | Halton Region |
| Ontario Addiction Treatment Centres, Methadone Maintenance Treatment | Oakville |
| Overeaters Anonymous, Oakville / Burlington Area Meetings | Burlington |
| PCHS, PCHS Brampton | Brampton |
| PCHS, PCHS Mississauga | Mississauga |
| Phoenix Medical Centre, Addictions and Recovery Clinic | Clarkson |
| Renascent, Toronto - Wright Centre | Toronto |
| Sex and Love Addicts Anonymous, Ontario Intergroup - Mailing Address | Toronto |
| Stonehenge Therapeutic Community | Guelph |
| Thrive Counselling, Counselling Services | Burlington |
| Wellbeings Medical Centre for Innovation & Excellence | Burlington |
| Women's College Hospital, Substance Use Service | Toronto |
