| | Organization Name(s) | Located In |
 | A Childs World - Family Child Care Services of Niagara | Welland |
| A Childs World - Family Child Care Services of Niagara, ACW Child Care, All Peoples | Welland |
| A Childs World - Family Child Care Services of Niagara, ACW Child Care, Country Kids | Wainfleet |
| A Childs World - Family Child Care Services of Niagara, ACW Child Care, EW Farr | Fenwick |
| A Childs World - Family Child Care Services of Niagara, ACW Child Care, Ferndale Child Care Centre | St Catharines |
| A Childs World - Family Child Care Services of Niagara, ACW Child Care, First Friends | Port Colborne |
| A Childs World - Family Child Care Services of Niagara, ACW Child Care, Forestview | Niagara Falls |
| A Childs World - Family Child Care Services of Niagara, ACW Child Care, Glenridge Hill | St Catharines |
| A Childs World - Family Child Care Services of Niagara, ACW Child Care, Lookout Ridge | Fonthill |
| A Childs World - Family Child Care Services of Niagara, ACW Child Care, Niagara Community | Niagara Falls |
| A Childs World - Family Child Care Services of Niagara, ACW Child Care, Oakwood | Port Colborne |
| A Childs World - Family Child Care Services of Niagara, ACW Child Care, Tiny Travellers | St Catharines |
| A Childs World - Family Child Care Services of Niagara, ACW Child Care/Early Learning, Connaught | St Catharines |
| A Childs World - Family Child Care Services of Niagara, ACW Early Learning, Cherrywood | Niagara Falls |
| A Childs World - Family Child Care Services of Niagara, ACW Early Learning, James Morden | Niagara Falls |
| A Childs World - Family Child Care Services of Niagara, ACW Early Learning, Kids World | Welland |
| A Childs World - Family Child Care Services of Niagara, ACW Early Learning, McKay | Port Colborne |
| A Childs World - Family Child Care Services of Niagara, ACW Early Learning, Princess Margaret | Niagara Falls |
| A Childs World - Family Child Care Services of Niagara, ACW Early Learning, River View | Niagara Falls |
| | A Childs World - Family Child Care Services of Niagara, ACW Early Learning, Sacred Heart | Chippawa |
| A Childs World - Family Child Care Services of Niagara, ACW Early Learning, St Andrew | Welland |
| | A Childs World - Family Child Care Services of Niagara, ACW Early Learning, Stevensville | Stevensville |
| A New Leaf Counselling | Welland |
| | AaaN Anaphylaxis asthma allergies Niagara | Niagara Falls |
| ABA Autism Services Niagara | Niagara Falls |
| | Abbey House | St Catharines |
| ABC Communautaire | Welland |
| ABC Communautaire, Literacy and Basic Skills | Welland |
| ABC Day Care | St Catharines |
| | Ability Online | Toronto (City of) |
| Abma Counselling Services | Niagara Falls |
| AboutFace | Toronto (City of) |
| Academy of Learning Niagara | St Catharines |
| | Accessible Niagara | St Catharines |
| | Acquired Brain Injury Outreach Network Inc, Rehabilitation | Ridgeway |
| | Across Niagara | St Catharines |
| Action Hypnosis, Holistic Therapy, Love your Labour Hypnosis for Childbirth, Baby Tree Fertility | St Catharines |
| ADD and Brain Treatment Centre of Niagara, The | St Catharines |
| Adolescent's Family Support Services of Niagara, Administration and Private Home Day Care | Welland |
| Adolescent's Family Support Services of Niagara, St Catharines Outreach Program | St Catharines |
| Adolescent's Family Support Services of Niagara, Sven H Dohnberg Centre | St Catharines |
| Adolescent's Family Support Services of Niagara, Welland Parent/Child Centre | Welland |
| Adult Literacy Council of Greater Fort Erie, The | Fort Erie |
| | Adventures In Friendship | Hamilton |
| Aereo Gymnastics | Welland |
| Agape Valley | Ridgeville |
| Agape Valley, Bible Camp | Ridgeville |
| AIDS Niagara | St Catharines |
| | Al-Anon Family Groups | Niagara Region |
| Albright Centre | Beamsville |
| | Alcohol Babies Anonymous | St Catharines |
| | Alcoholics Anonymous (AA) | St Catharines |
| All Nations Fellowship | Ridgeway |
| All Peoples' United Church | Welland |
| All Saints Anglican Church, Dain City | Welland |
| All Saints Anglican Church, Ridgeway | Ridgeway |
| All Star Athletics, the Cheer and Tumble Experts | Beamsville |
| Allergy Asthma Information Association, National Office | Vaughan |
| | Alpenroesl Boys and Girls Dance Group | St Catharines |
| AlphaPlus | Toronto (City of) |
| ALS Canada | Markham |
| Alzheimer Society of Niagara Region | St Catharines |
| Ambulatory Internal Medicine Teaching Clinic | St Catharines |
| | Amnesty International, Group 137, Niagara-on-the-Lake Chapter | Niagara-on-the-Lake |
| | An Myer Concert Band | Niagara Falls |
| Anchor Pointe, Gracious Retirement Living | St Catharines |
| | Animal Assistance Society of the Niagara Region Inc | St Catharines |
| Anna's Day Care Centre | Thorold |
| Another Perspective Family Centres Inc, St Catharines | St Catharines |
| Anxiety Disorders Association of Ontario | Ottawa |
| Apartment Centre, The | St Catharines |
| ARID Group Homes (Niagara), Fort Erie | Fort Erie |
| ARID Group Homes (Niagara), Thorold | Thorold |
| Armenian Community Centre | St Catharines |
| Arthritis Society, The, Niagara Peninsula Office | St Catharines |
| Artist's Studio, Residency & Gallery, Linda Hankins' School of Ideas | Welland |
| | ASL For Everyone, Removing Communication Barriers One Hand at a Time, American Sign Language Workshops for the Hearing Community | St Catharines |
| Association for Bright Children of Ontario | Oakville |
| | Association of Kin Clubs of Canada (The), Kinsmen Club, Fonthill & District | Fonthill |
| | Association of Kin Clubs of Canada (The), Kinsmen Club, Grimsby | Grimsby |
| | Association of Kin Clubs of Canada (The), Kinsmen Club, Niagara-on-the-Lake | Niagara-on-the-Lake |
| Association of Kin Clubs of Canada (The), Zone D, Kinsmen, Kinette and Kin Clubs | Niagara Falls |
| | Association of Parent Support Groups in Ontario Inc | Toronto (City of) |
| | Association of Universities and Colleges of Canada, Mattinson Scholarship Program for Students with Disabilities | Ottawa |
| Asthma Society of Canada | Toronto (City of) |
| Attachment and Trauma Treatment Centre for Healing | |
| Attoe Counselling and Psychotherapy | Niagara-on-the-Lake |
| Au Coin des petits | St Catharines |
| Autism Ontario - Niagara Chapter | St Catharines |
| Automobile Protection Association | Toronto (City of) |
| | Avanti Chamber Singers | St Catharines |
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