| Cabbagetown Women's Clinic | Toronto Downtown East |
| Camp Quality Canada, Camp Quality Southern Ontario, Camp for Children with Cancer and Blood Disorders | Toronto |
| Canada. Canada Learning Bond | Gatineau |
| Canada. Canada Revenue Agency, Registered Disability Savings Plan (RDSP) | |
| Canada. Canada Revenue Agency, Toronto Region, Canada Child Benefit | Toronto |
| Canada. Health Canada, Ontario Region, First Nations and Inuit Health Branch | Ottawa |
| Canada. Health Canada, Cannabis in Canada | Ottawa |
| Canada. Immigration, Refugees and Citizenship Canada, Greater Toronto Area, Citizenship and Immigration Centre, Mississauga office | Mississauga |
| Canada. Indigenous Services Canada, Indian Residential Schools Settlement Agreement | Gatineau |
| Canada. Office of the Federal Ombudsperson for Victims of Crime | Ottawa |
| Canadian Academy of Dental Health and Community Sciences - Division of the Canadian Academy of Dental Hygiene, Dental Hygiene Clinic | Mississauga |
| Canadian Association for Girls in Science, Oakville Chapter - Mailing Address | Oakville |
| Canadian Association of the Deaf | Ottawa |
| Canadian Cancer Society - Ontario Division, Cancer Information Service | Toronto Downtown North |
| Canadian Cancer Society - Ontario Division, Smokers' Helpline | Toronto Downtown North |
| Canadian Cancer Society - Ontario Division - Peer Match Program, Canadian Cancer Society - Ontario Division | Toronto Downtown North |
| Canadian Caribbean Association of Halton, Cultural Heritage Group | Oakville |
| Canadian Centre for Child Protection Inc | Winnipeg |
| Canadian Centre for Men and Families, Canadian Centre for Men and Families - Toronto | Toronto |
| Canadian Centre for Victims of Torture, Counselling and Support Services, Mississauga Office | Mississauga |
| Canadian Centre on Substance Use and Addiction, Ottawa | Ottawa |
| Canadian Centre to End Human Trafficking, Canadian Human Trafficking Hotline | Toronto |
| Canadian Council on Rehabilitation and Work | Toronto |
| Canadian Croatian Choral Society | Oakville |
| Canadian Dental Care Plan | Thunder Bay |
| Canadian Federation of University Women, Burlington Chapter | Burlington |
| Canadian Federation of University Women, Milton and District Chapter - Mailing Address | Milton |
| Canadian Forces Morale and Welfare Services, Support Our Troops Fund | Ottawa |
| Canadian Hard of Hearing Association, Canadian Hard of Hearing Association Advocacy and Support Groups | |
| Canadian Hard of Hearing Association, Ottawa, Canadian Hard of Hearing Association, Ottawa | Ottawa |
| Canadian Hearing Services, Hamilton Regional Office, Canadian Hearing Services, Canadian Hearing Services Support Groups and Counselling | Hamilton |
| Canadian Hearing Services - Toronto and York Region, Canadian Hearing Services, Mississauga Regional Office | Mississauga |
| Canadian Hemophilia Society, Toronto and Central Ontario Region, Blood Disorders Information and Support | Scarborough North |
| Canadian Human Rights Commission | Ottawa |
| Canadian Indian Association of Halton Region, Cultural Heritage Group | Oakville |
| Canadian Information Centre for International Credentials | Toronto |
| Canadian Japanese Cultural Centre of Hamilton, Canadian Japanese Cultural Centre of Hamilton Programs | Hamilton |
| Canadian Liver Foundation, Markham - National Office and Toronto/GTA Chapter | Markham |
| Canadian Mental Health Association, Halton Region Branch Head Office - Oakville, Mental Health Services | Oakville |
| Canadian Mental Health Association, Halton Region Branch - Milton Office, Mental Health Services | Milton |
| Canadian Mental Health Association, Education and Training | Oakville |
| Canadian Mental Health Association, Mobile Outreach Team - COAST | Oakville |
| Canadian Mental Health Association, Free Call-In Counselling | Halton Region |
| Canadian Mental Health Association, York Region and South Simcoe, CMHA Vaughan, BounceBack Ontario | Vaughan |
| Canadian Paediatric Society, Caring for Kids | Ottawa |
| Canadian Parents of Murdered Children and Survivors of Homicide Victims | Ottawa |
| Canadian Red Cross, Burlington Branch, Meals on Wheels | Burlington |
| Canadian Red Cross, Burlington Branch, Transportation | Burlington |
| Canadian Red Cross, Halton and Peel Regional Office, First Aid and CPR | Mississauga |
| Canadian Red Cross, Halton and Peel Regional Office, Violence, Bullying and Abuse Prevention | Mississauga |
| Canadian Resource Centre for Victims of Crime | Ottawa |
| Canadian Spondyloarthritis Association | Toronto Downtown |
| Canadian Tire Jumpstart, Toronto - Provincial Office, Recreation Expense Assistance | Toronto |
| Canadian Tire Jumpstart, Halton Hills Chapter, Recreation Expense Assistance | Halton Hills |
| Canadian Ukrainian Immigrant Aid Society, Toronto - Main Office | Toronto |
| Canadian Virtual Hospice | Winnipeg |
| Capability Support Services, Burlington - Carey House, Shared Living | Burlington |
| Care Connections of Halton Hills | Halton Hills |
| Career Edge Organization | Toronto |
| CareNow Ontario | North York West |
| Carpenter Hospice | Burlington |
| Catholic Crosscultural Services, Catholic Crosscultural Services, Mississauga - 4557 Hurontario St Site | Mississauga |
| CATIE (Canadian AIDS Treatment Information Exchange) | Toronto Downtown Central |
| CATIE (Canadian AIDS Treatment Information Exchange), Where To? | Toronto Downtown Central |
| Cedar Springs Ski Club | Burlington |
| Central Registry, Food Support Programs | Oakville |
| Central West Specialized Developmental Services, Developmental Services | Oakville |
| Central West Specialized Developmental Services, Halton Support Services | Oakville |
| Central West Specialized Developmental Services, Respite Services | Oakville |
| Centre for Addiction and Mental Health, CAMH Support Resources and Information Services | Toronto |
| Centre for Addiction and Mental Health, Addiction Medicine Services and Specialized Clinics | Toronto |
| Centre for Diverse Learners | Burlington |
| Centre for Skills Development, Burlington - Appleby Line, LINC (Language Instruction for Newcomers to Canada) and Immigrant Services | Burlington |
| Centre for Skills Development, Burlington - North Service Rd, Skilled Trades Training Programs | Burlington |
| Centre for Skills Development, Burlington - South Service Rd, Doorways - Literacy and Basic Skills | Burlington |
| Centre for Skills Development, Burlington - South Service Rd, Integrated Employment Services | Burlington |
| Centre for Skills Development, Burlington - South Service Rd, LINC (Language Instruction for Newcomers to Canada) and Immigrant Services | Burlington |
| Centre for Skills Development, Milton - Ontario St S - Suite 208, Integrated Employment Services | Milton |
| Centre for Skills Development, Milton - Ontario St S - Unit 15, LINC (Language Instruction for Newcomers to Canada) and Immigrant Services | Milton |
| Centre for Skills Development, Oakville - Abbeywood Dr, LINC (Language Instruction for Newcomers to Canada) and Immigrant Services | Oakville |
| Centre for Skills Development, Oakville - Morden Rd, Integrated Employment Services | Oakville |
| Certified Listeners Society | Burlington |
| CFUW Georgetown, Georgetown Chapter | Georgetown |
| CFUW Oakville | Oakville |
| Chai Lifeline Canada | Toronto |
| Challenge Golf | Oakville |
| CharterAbility | Oakville |
| Child Abuse and Neglect Reporting, Halton Region | Halton Region |
| Child and Parent Resource Institute (CPRI) | London |
| Childhood Cancer Canada | Toronto Downtown Central |
| Children and Youth Grief Network | Peel Region |
| Chinese Association of Mississauga, Mississauga | Mississauga |
| Chinmaya Mission Halton Region | Milton |
| Chisholm Academy | Oakville |
| Circle of Friends Tai Chi Club | Milton |
| Civitan Club of Oakville | Oakville |
| CNIB, Toronto Region, Deafblind Community Services | North York Central |
| Cocaine Anonymous | Toronto Downtown Central |
| College of Physicians and Surgeons of Ontario | Toronto Downtown Central |
| Colorectal Cancer Resource and Action Network (CCRAN) | Oakville |
| Community Development Halton, Acton | Acton |
| Community Development Halton, Burlington | Burlington |
| Community Development Halton, Volunteer Halton | Burlington |
| Community Living Burlington | Burlington |
| Community Living Burlington, Burlington - Lakeshore Rd, Integrated Employment Services | Burlington |
| Community Living North Halton | Milton |
| Community Living North Halton, Adult Services and Supports | Milton |
| Community Living North Halton, Services for Children and Youth | Milton |
| Community Living Oakville | Oakville |
| Community Living Oakville, Oakville - Dorval Dr, Community Connect - Day Services | Oakville |
| Community Living Oakville, Oakville - Dorval Dr, Supported Living | Oakville |
| Community Living Oakville, Integrated Employment Services | Oakville |
| Community Living Ontario | North York East |
| Community Midwives of Halton, Oakville | Oakville |
| Community Midwives of Halton, Milton | Milton |
| Compass Point Bible Church, Food Market | Burlington |
| Compassion Society of Halton | Burlington |
| Compassion Society of Halton, Burlington, Food Market | Burlington |
| Connected Care Halton Ontario Health Team (CCHOHT), Navigation Line | Oakville |
| ConnexOntario, Helpline | London |
| ConnexOntario, mindyourmind | London |
| Conseil scolaire catholique MonAvenir, Halton Locations, French Language Catholic Schools | Halton Region |
| Conseil Scolaire Viamonde, Halton Locations, French Language Public Schools | Halton Region |
| Conservation Halton | Burlington |
| Conservation Halton, Green Space: Newcomer Youth Climate Forum | Burlington |
| Conservation Halton, Burlington - Mount Nemo Conservation Area, Conservation Land & Recreational Trails | Burlington |
| Conservation Halton, Campbellville - Mountsberg Conservation Area, Conservation Land & Recreational Trails | Milton |
| Conservation Halton, Milton - Area 8 Conservation Area, Conservation Land & Recreational Trails | Milton |
| Conservation Halton, Milton - Crawford Lake Conservation Area, Conservation Land & Recreational Trails | Milton |
| Conservation Halton, Milton - Hilton Falls Conservation Area, Conservation Land & Recreational Trails | Milton |
| Conservation Halton, Milton - Kelso Conservation Area / Glen Eden, Conservation Land & Recreational Trails | Milton |
| Conservation Halton, Milton - Rattlesnake Point Conservation Area, Conservation Land & Recreational Trails | Milton |
| Conservation Halton, Milton - Robert Edmondson Conservation Area, Conservation Land & Recreational Trails | Milton |
| Conservation Halton, Summer Camps | Burlington |
| Conservation Halton, Youth Group Programs | Burlington |
| Cornwall Medical Clinic | Oakville |
| COSTI, ArriveON App | Ontario |
| COSTI, International Student Connect | Toronto |
| COSTI, Orientation to Ontario | Toronto |
| Covenant House Toronto, Toronto - Gerrard St E, Emergency Shelter | Toronto |
| COVID-19 Assessment Centres and Testing Options, Halton Region | Halton Region |
| COVID-19 Information, Halton Region | Halton Region |
| COVID-19 Vaccine Information, Halton Region | Halton Region |
| Creative Community Hive, Burlington, Oakville and Milton, Community Crafting Sessions | Halton Region |
| Credit Valley Conservation Authority, Limehouse Conservation Area, Conservation Land & Recreational Trails | Halton Hills |
| Credit Valley Conservation Authority, Silver Creek Conservation Area, Conservation Land & Recreational Trails | Halton Hills |
| Croatian Folklore Ensemble Hrvatsko Prelo | Oakville |
| Croatian Social and Cultural Centre | Halton Hills |
| Crohn's and Colitis Canada | Toronto Downtown Central |
| Crohn's and Colitis Canada, Halton Region Chapter | Halton Region |
| Cross-Cultural Community Services Association, The, Cross-Cultural Community Services Association, The, TCCSA Peel Centre | Mississauga |
| Crossings Community Church | Acton |
| Crusaders Rugby Club | Oakville |
| Crystal Care Medical Clinic, Family Practice and Walk-in | Milton |
| Cultural Interpretation Services for Our Communities | Ottawa |
| Custody Review Board, Toronto | Toronto |
| Cystic Fibrosis Canada, Cystic Fibrosis Canada Hamilton Chapter Location, Cystic Fibrosis Canada Hamilton Chapter Services | Hamilton |
