| | Organization Name(s) | Located In |
 | Calvary Church | St Catharines |
 | Calvary Church, Wednesday Night Live | St Catharines |
| | Canadian Diabetes Association, Niagara Region | St Catharines |
 | Canadian Foundation for the Study of Infant Deaths | St Catharines |
 | Canadian Red Cross Society, The, Niagara Area Branches | St Catharines |
 | CAPC Niagara Brighter Futures | Welland |
 | Carlton Heights Medical Clinic - Unit 16, Dr Ravindran | St Catharines |
 | Carlton Medical Clinic - Unit 8, Dr Oladipo | St Catharines |
 | Carroll's Bowling Lanes, Carroll's Kids Bowling League | Fort Erie |
 | Casa El Norte | Fort Erie |
 | Catechist Sisters of the Sacred Heart Childrens Day Care | Thorold |
 | Central Community Church | St Catharines |
 | Central United Church, Welland | Welland |
 | Centre de Santé Communautaire Hamilton/Niagara | Welland |
 | Centre de Santé Communautaire Hamilton/Niagara, Services for Families with Young Children, Coin des familles | Welland |
 | Chez Marie Refugee Assistance Centre | St Catharines |
 | Child and Family Counselling - CAFC, Niagara Falls | Niagara Falls |
 | Child and Family Counselling - CAFC, St Catharines | St Catharines |
| | Childrens Mental Health Network | Welland |
 | Christ Church Anglican, McNab | Niagara-on-the-Lake |
 | Christ Community Church | Welland |
 | Christ Lutheran Church | St Catharines |
 | Church in St Catharines, The | St Catharines |
 | Church of the Good Shepherd, The | St Catharines |
 | Club at White Oaks, The, Summer Camps and Programs 2012 | Niagara-on-the-Lake |
| | Club Cultural Latin Americano | St Catharines |
| | COAST Niagara, Crisis Outreach and Support Team | Niagara Region |
 | Community Care of West Niagara | Beamsville |
 | Community Living - Fort Erie, Administration/Community Services | Fort Erie |
 | Community Living - Fort Erie, Family Support Services | Fort Erie |
 | Community Living - Grimsby, Lincoln and West Lincoln, Administration/Community Services | Beamsville |
 | Community Living - Grimsby, Lincoln and West Lincoln, Children's Weekend Respite Program | Beamsville |
 | Community Living Port Colborne - Wainfleet, Administrative Office | Port Colborne |
 | Community Living St Catharines, Administrative Offices | St Catharines |
 | Community Living St Catharines, St Catharines Preschool Services | St Catharines |
 | Community Living Welland Pelham | Welland |
 | Community Living Welland Pelham, Children's Services | Welland |
 | Community Living Welland Pelham, Family Support Services | Welland |
| | Compassionate Friends of Niagara, Niagara Region | St Catharines |
 | Comprehensive Health Clinic, Medical Walk-in and Wound Clinic | St Catharines |
 | Conseil scolaire de district catholique Centre-Sud | Toronto (City of) |
 | Conseil scolaire Viamonde | Welland |
 | Contact Brant For Children's and Developmental Services | Brantford |
 | Contact Niagara for Children's and Developmental Services | St Catharines |
 | Covenant Christian Reformed Church | St Catharines |
 | Crystal Beach Childcare Inc | Crystal Beach |
 | Crystal Ridge Skating Club | Ridgeway |