| Organization Name(s) | Located In |
| Abbott Laboratories. Ensure Consumer Relations | Montréal |
| Aambe Life | Wiarton |
| ABACUS Help for Parents, Listing of Ontario Autism ABA Providers | Toronto |
| Ability Online | Etobicoke |
| Aboriginal Human Resource Council | Saskatoon |
| AboutFace | Toronto |
| Access 2 Entertainment Card | Toronto |
| ActivEars Hearing Centre | Owen Sound |
| ActivEars Hearing Centre | Hanover |
| Adoption Council of Ontario | Toronto |
| Adult Learning Centres Grey-Bruce-Georgian, Bruce Peninsula, Literacy and Basic Skills | Wiarton |
| Adult Learning Centres Grey-Bruce-Georgian, Owen Sound & North Grey Union Public Library, Literacy and Basic Skills | Owen Sound |
| Adult Learning Centres Grey-Bruce-Georgian, Saugeen Shores, Literacy and Basic Skills | Port Elgin |
| Adult Learning Centres Grey-Bruce-Georgian, Walkerton & Area, Literacy and Basic Skills | Walkerton |
| Adult Protective Services | Owen Sound |
| Advanced Pain Relief Clinic. Owen Sound Location | Owen Sound |
| Advocacy Centre For The Elderly | Toronto |
| AFS Interculture Canada, International Student Exchange Organization | Montréal |
| After Bereavement for Widows | Kincardine |
| Agency Temporary Employment Services Inc (The). Owen Sound | Owen Sound |
| Agency Temporary Employment Services Inc (The). Walkerton | Walkerton |
| Agricorp, Call centre | Guelph |
| Al-Anon. Bruce Grey Huron | Bruce County |
| Alcoholics Anonymous. Western Georgian Bay. District 9 | Owen Sound |
| Algonquin Provincial Park | Algonquin |
| All Languages | Toronto |
| Allenford Curling Club | South Bruce Peninsula |
| Allenford Natural Health Clinic | South Bruce Peninsula |
| Allergy/Asthma Information Association | Vaughan |
| Alzheimer Society of Grey-Bruce | Owen Sound |
| Alzheimer Society of Grey-Bruce, Alzheimer Caregiver Support | Kincardine (Town of) |
| Alzheimer Society of Grey-Bruce, First Link (TM) Program | Owen Sound |
| Amabel-Sauble Child Care Centre | Sauble Beach |
| Amabel-Sauble Community School | Sauble Beach |
| Amethyst School, Provincial Demonstration School | London |
| Amnesty International. South Bruce Group 97 | Kincardine |
| Amyotrophic Lateral Sclerosis Society of Ontario | North York |
| Anaphylaxis Canada | Toronto |
| Anderson [June] | Meaford |
| Angels of Flight Canada Inc. | Peterborough (City of) |
| Anglican Parish of the Bruce Peninsula. Christ Church | Lion's Head |
| Anglican Parish of the Bruce Peninsula. St Andrew's Church | South Bruce Peninsula |
| Anglican Parish of the Bruce Peninsula. St Edmund's Church | Tobermory |
| Anglican Parish of the Bruce Peninsula. St Margaret's Church | Northern Bruce Peninsula |
| Anglican Parish of the Bruce Peninsula. St Peter's Church | Sauble Beach |
| Anglican Parish of the Bruce Peninsula. Trinity Church | Wiarton |
| Anishinabek Child & Youth Prevention Service | Southampton |
| ARCH Disability Law Centre | Toronto |
| Arran-Elderslie. Municipal Office | Chesley |
| Arran-Elderslie. Tara-Arran Fire Department | Tara |
| Arran-Tara Elementary School | Tara |
| Arrowhead Provincial Park | Huntsville |
| Arthritis Society (The). Grey Bruce District | Owen Sound |
| Arthritis Society (The). Ontario Division | Toronto |
| Ashfield Presbyterian Church | Ashfield-Colborne-Wawanosh |
| Assaulted Women's Helpline | Toronto |
| Association for the Neurologically Disabled of Canada | Etobicoke |
| Association of Hearing Instrument Practitioners of Ontario | Lindsay |
| Association of Translators and Interpreters of Ontario | Ottawa |
| Asthma Society of Canada | Toronto |
| Audiologist and Psychologist | Kincardine (Town of) |
| Auditory Health Care | Walkerton |
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