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| Oak Ridges Trail Association, Caledon Chapter | King City |
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 | Oakville Physiotherapy Centre | Oakville |
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 | Oakwood Academy | Meadowvale |
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 | Oasis Centre des Femmes | Brampton |
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 | Office of the Independent Police Review Director | Toronto |
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 | Office of the Ombudsman of Ontario | |
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| Olive Grove Preschool and Toddler Program, Muslim Association of Canada | |
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 | Olive Grove School | Erin Mills |
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| Oliver House | Caledon |
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 | Ontario Addiction Treatment Centres (OATC), Brampton Clinic, Queen St | Brampton |
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| Ontario Autism Program (OAP) | Ontario |
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 | Ontario Aviation Historical Society, Great War Flying Museum | Cheltenham |
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 | Ontario Camps Association | Toronto North |
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 | Ontario College Application Services | Guelph |
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 | Ontario Diagnostic Centre (ODC) - Etobicoke - Humber College Blvd | Etobicoke North |
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 | Ontario Diagnostic Centre, Brampton, (Golden Gate X-Ray) | Brampton |
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 | Ontario Diagnostic Centre (OCD) - Brampton | Brampton |
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 | Ontario Diagnostic Centre (ODC) - Etobicoke - Albion Rd | Etobicoke North |
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 | Ontario Diagnostic Centres, Mississauga - King St | Mississauga |
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 | Ontario Diagnostic Centres, Radiology Associates, Square One | Mississauga |
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 | Ontario Diagnostic Centres - Clarkson | Mississauga |
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 | Ontario Diagnostic Imaging Centre (ODIC), Etobicoke - Rexdale Blvd | Etobicoke North |
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 | Ontario Federation of Anglers and Hunters | Peterborough |
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| Ontario Federation of Teaching Parents | Gananoque |
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| Ontario Genealogical Society, Halton Peel Branch | Mississauga |
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 | Ontario Health atHome, Brampton | Brampton |
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| Ontario Health atHome, Brampton, Health Care Connect Program | Brampton |
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 | Ontario Health atHome - Brampton, Integrated Care Clinic, Brampton | Brampton |
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 | Ontario Home Health, Respiratory and Sleep Therapy (CPAP) | Orangeville |
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| Ontario Learning Development Foundation Inc., Peel Summer Camps | Peel Region |
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 | Ontario Lottery and Gaming Coorporation, OLG | Toronto |
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 | Ontario March of Dimes, West Central Regional Office | Mississauga |
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 | Ontario Medical Imaging, Georgetown | Georgetown |
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 | Ontario Ministry of Community Safety and Correctional Services, Ontario Correctional Institute | Brampton |
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 | Ontario Ministry of the Solicitor General, Office of the Chief Coroner, Regional Supervising Coroner's Office, Central West Region | Guelph |
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 | Ontario Ministry of Transportation, Driver Examination Centres, Etobicoke Centre | Etobicoke Central |
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 | Ontario Ministry of Transportation, Ontario Drive Test Centre-Orangeville | Orangeville |
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 | Ontario Pet Loss Support Group | Mississauga |
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 | Ontario Provincial Police, Caledon Criminal Investigative Services | Caledon Village |
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 | Ontario Provincial Police, Caledon Detachment | Caledon East |
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| Ontario Registered Music Teachers' Association | Bolton |
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| Ontario Tenants Rights, Housing Information | Peel Region |
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 | Ontario Track 3 Adaptive Sports Association | Toronto |
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| Ontario Travel Clinic | |
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 | Ontario Universities Application Centre | Guelph |
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| Ontario Volunteer Centre Network | Ontario |
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 | Ontario. Employment Ontario, Apprenticeship Office, Central Region, Mississauga Apprenticeship Office | Mississauga |
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| Ontario. Ministry of Advanced Education and Skills Development, Employment Ontario Contact Centre | Toronto |
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 | Ontario. Ministry of Children, Community and Social Services, Adoption Disclosure Registry | Toronto Central |
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 | Ontario. Ministry of Children, Community and Social Services, Adoption Unit | Toronto Central |
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 | Ontario. Ministry of Children, Community and Social Services, Central Region, Special Services at Home (SSAH) | Mississauga |
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 | Ontario. Ministry of Children, Community and Social Services, Central West Region | Mississauga |
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| Ontario. Ministry of Children, Community and Social Services, Family Responsibility Office | Mississauga |
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 | Ontario. Ministry of Children, Community and Social Services, Ontario Disability Support Program, Employment Supports, Brampton Office | Brampton |
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 | Ontario. Ministry of Children, Community and Social Services, Ontario Disability Support Program, Income and Employment Supports, Mississauga Office | Mississauga |
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 | Ontario. Ministry of Children, Community and Social Services, Ontario Works | Peel Region |
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 | Ontario. Ministry of Children, Community and Social Services, Youth Justice Services, Brampton Youth Probation Office | Brampton |
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 | Ontario. Ministry of Children, Community and Social Services, Youth Justice Services, Mississauga Office | Mississauga |
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 | Ontario. Ministry of Community Safety and Correctional Services, Probation and Parole Services, Brampton Office | Brampton |
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 | Ontario. Ministry of Government and Consumer Services, ServiceOntario, INFOline | Toronto Central |
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 | Ontario. Ministry of Government Services, Archives Of Ontario | Toronto |
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| Ontario. Ministry of Government Services, ServiceOntario, Provincial Office | Thunder Bay |
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 | Ontario. Ministry of Labour, Employment Standards | Mississauga |
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 | Ontario. Ministry of Labour, Occupational Health and Safety, Central Regional Office, Peel District Office | Mississauga |
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 | Ontario. Ministry of Natural Resources, Niagara Escarpment Commission, Georgetown Office | Georgetown |
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 | Ontario. Ministry of the Attorney General, Central West Region, Peel Region, A Grenville & William Davis Courthouse | Brampton |
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 | Ontario. Ministry of the Attorney General, Family Justice Matters, Office of the Public Guardian and Trustee | Toronto Central |
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 | Ontario. Ministry of the Attorney General, Office Of The Children's Lawyer | Toronto Central |
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 | Ontario. Ministry of the Attorney General, Ontario Court Of Justice, Provincial Division, Family Court | Brampton |
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 | Ontario. Ministry of the Attorney General, Victim Support Line | Toronto |
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 | Ontario. Ministry of the Environment and Climate Change, Spills Action Centre | North York Central |
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| Ontario. Ministry of Training, Colleges and Universities, Ontario Student Assistance Program | Thunder Bay |
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| Ontario. Ministry of Transportation, Accessible Parking Permit | Ontario |
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 | Ontario. Ministry of Transportation, Driver Examination Centres, Brampton Centre | Brampton |
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| Ontario. Ministry of Transportation, Travel Information (511) | Ontario |
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 | Open Arms Preschool & Early Learning Centre | |
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 | Open Book Childcare Centres Inc. | |
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 | Open Book Daycare Centres Inc. | Brampton |
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| Opportunities Mississauga for 21 Plus | Mississauga |
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| Optimist Club, Optimist Club of Caledon | Caledon Village |
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 | Options Mississauga | Mississauga |
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 | Orange Care Pharmacy, Orangeville - Lakeview Court | Orangeville |
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| Orangeville and District Horticultural Society | Orangeville |
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 | Orangeville and District Seniors Centre | Orangeville |
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 | Orangeville Christian School | Orangeville |
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 | Orangeville Family Footcare | Orangeville |
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 | Orangeville Food Bank | Orangeville |
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 | Orangeville Foot Clinic | Orangeville |
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 | Orangeville Hearing Clinic | Orangeville |
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 | Orangeville Medical Imaging | Orangeville |
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 | Orangeville Medical Imaging, Ontario Breast Screening Program (OBSP) | Orangeville |
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 | Orangeville Public Library, Alder St Branch | Orangeville |
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 | Orangeville Public Library, Main Branch | Orangeville |
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 | Orangeville Speech and Language Clinic, Kindrey Rowland and Associates | Orangeville |
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| Osteoporosis Canada | Canada |
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 | Our Lady of the Airways Church | Malton |
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 | Our Place Peel, Emergency Youth Shelter, Transitional Program | Mississauga |
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| Overeaters Anonymous | Peel Region |
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 | Oxford Learning Centre - Meadowvale | Meadowvale |
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 | Oxford Learning Centre - Springdale | Bramalea |
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 | Oxford Learning Centre Bolton | Bolton |