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 | A Cappella Showcase | Waterdown |
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 | A Child's Voice Foundation, Mississauga | Mississauga |
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 | A+ Medical Centre and Walk-In | Milton |
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 | Ability Online Support Network, Mono - Online Service | Mono |
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 | AbleLiving Services, Burlington - Bethany Residence, Supportive Housing | Burlington |
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 | AbleLiving Services, Burlington - Palmer Place, Supportive Housing | Burlington |
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 | Aboriginal Legal Services | Toronto |
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 | AboutFace | North York West |
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| ABRAR Trauma and Mental Health, ABRAR Trauma and Mental Health Services | Hamilton (City of) |
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 | Access Midwives, Midwifery Services | Hamilton |
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 | AccessOAP | Toronto |
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 | Acclaim Health, Home Care | Oakville |
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 | Acclaim Health, Hospice Care and Bereavement Support | Oakville |
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 | Achēv, Oakville, Newcomer Information Centre | Oakville |
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 | Achēv, Language Assessment Centres, Mississauga Location, Mississauga - 50 Burnhamthorpe Rd W | Mississauga |
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 | Achēv, Newcomer Information Centre, Mississauga Location | Mississauga |
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 | Achēv, Accelerating Career Advancement Program | Mississauga |
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 | Achēv, Oakville, Language Assessment Centre | Oakville |
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 | Acoustic Neuroma Association of Canada | Toronto |
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 | Action Canada for Sexual Health and Rights | Ottawa |
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 | Active Aldershot Society | Burlington |
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 | Acton Aqua Ducks Swim Club | Acton |
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 | Acton Badminton Club, Recreational Badminton | Acton |
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 | Acton Citizens Band | Acton |
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 | Acton Curling Club | Acton |
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 | Acton Foodshare, Food Bank | Acton |
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 | Acton Medical and Urgent Care | Halton Hills |
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 | Acton Skating Club | Acton |
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 | Acton Soccer Club | Acton |
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 | Acton-Halton Walk-in Clinic | Halton Hills |
|
 | ADAPT Halton, Oakville - Head Office, Alcohol, Drug and Gambling Assessment, Prevention and Treatment Services | Oakville |
|
 | ADAPT Halton, Burlington Office | Burlington |
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| ADAPT Halton, Community Justice Programs | Halton Region |
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| ADAPT Halton, Community Withdrawal Management Services | Halton Region |
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| ADAPT Halton, Concurrent Disorders Programs | Halton Region |
|
 | ADAPT Halton, Georgetown Office | Georgetown |
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 | ADAPT Halton, Milton Office | Milton |
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| ADAPT Halton, Problem Gambling & Behavioural Addictions Services | Halton Region |
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| ADAPT Halton, Youth Programs | Halton Region |
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| Adaptive Clothing, Halton Region | Ontario |
|
 | Adult Learning Centre, Georgetown - Head Office, Essential Skills for Employment | Georgetown |
|
 | Adult Learning Centre, Acton - Halton Hills Public Library | Acton |
|
 | Adult Learning Centre, Burlington - Centre for Skills Development | Burlington |
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 | Adult Learning Centre, Literacy and Basic Skills | Halton Region |
|
 | Adult Learning Centre, Milton - Centre for Skills Development | Milton |
|
 | Adult Learning Centre, Oakville - Centre for Skills Development | Oakville |
|
 | Adults in Motion, Day Program | Oakville |
|
 | Afghan Association of Ontario, Canada, Toronto | Toronto |
|
 | African Community Services of Peel, Brampton, Family Program | Brampton |
|
 | African Community Services of Peel, Brampton, Newcomer Settlement Program | Brampton |
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 | African Community Services of Peel, Brampton, Violence Against Women Program | Brampton |
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 | AgScape | Milton |
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 | Akwaba Cultural Exchange, Cultural Heritage Group | Milton |
|
 | 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 |
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 | Alcoholics Anonymous, Oakville - Halton District Office, Halton Area Meetings | Halton Region |
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 | Alcoholics Anonymous, North Halton / Erin District, Erin and Area Meetings | Erin |
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 | Alcoholics Anonymous (GTA), Find an Alcoholics Anonymous Meeting - Greater Toronto Area Intergroup | Ontario |
|
 | Alcoholics Anonymous Hamilton, Alcoholics Anonymous Meetings | Hamilton (City of) |
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 | Aldershot Lions Club | Burlington |
|
 | Aldershot Tennis Club | Burlington |
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 | Alliance for South Asian AIDS Prevention, Toronto | Toronto |
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 | Alpha Care Medical Center | Halton Hills |
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 | Anglican Church of the Incarnation | Oakville |
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 | Anonymous Friend, Youth Peer to Peer Mental Health Support | Oakville |
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 | Aplastic Anemia and Myelodysplasia Association of Canada, Brighton | Brighton (Municipality of) |
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 | Appleby College | Oakville |
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 | Appleby College, Appleby Academy | Oakville |
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 | Appleby College, March Break Camps | Oakville |
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 | Appleby College, Newcomers Tutoring Program | Oakville |
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 | Appleby College, Summer Camp Programs | Oakville |
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 | Appleby Tennis Club | Burlington |
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 | Apples and Angels Montessori School and Day Care, Georgetown - 79 Main St, Licensed Child Care Centre | Georgetown |
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 | ARCH Disability Law Centre | Toronto |
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 | Armenian Family Support Services | Toronto |
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 | Art Gallery of Burlington | Burlington |
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 | ArtHouse for Children and Youth | Oakville |
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 | ARTSHINE Inc. / Arts4All | Kitchener |
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 | Arubah Kids Clinic | Mississauga |
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 | Asian Community AIDS Services, Toronto | Toronto |
|
 | Assaulted Women's Helpline | Toronto |
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 | Associated Youth Services of Peel, Mississauga | Mississauga |
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 | Association of Ontario Midwives | Toronto Downtown Central |
|
 | Asthma Canada | Toronto Downtown North |
|
 | Atwell Centre, Oakville, Pregnancy Support Services | Oakville |
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 | Aura Freedom International | Toronto |
|
 | Autism Ontario, Halton Chapter - Mailing Address | Burlington |
|
 | Autism Ontario | Toronto Downtown West |
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 | Average Joe Sports Club, Co-ed Recreational Sports Leagues | Oakville |