| | Organization Name(s) | Located In |
| | Canadian Information and Networking Services, CanadaInfoNet | Canada |
 | Canadian Telecommunications Consultants Association | St David's |
 | College of Nurses of Ontario | Toronto |
| | Diabetes Niagara Network | St Catharines |
 | ETFO-Niagara, ETFO Niagara Teachers Local, Elementary Teachers Federation of Ontario | Fonthill |
| | Graduate Nurses Association | St Catharines |
| | Human Resources Professionals Association of Niagara | Fonthill |
| | International Association of Administrative Professionals, Horseshoe Falls Chapter | St Catharines |
 | JCI St Catharines | St Catharines |
 | Law Society of Upper Canada | Toronto (City of) |
 | Lincoln County Law Association | St Catharines |
| | Niagara Dental Hygienists Society | Thorold |
| | Niagara District Funeral Service Association | St Catharines |
| | Niagara Falls City Church Network | Niagara Falls |
 | Niagara Home Builders' Association | St Catharines |
| | Niagara Peninsula Dental Association | St Catharines |
| | Niagara Society of Architects | St Catharines |
| | Ontario Association of Social Workers | St Catharines |
 | Ontario College of Pharmacists | Toronto (City of) |
| | Ontario Medical Association, Greater Niagara Medical Society | Niagara Falls |
| | Ontario Medical Association, Lincoln County Academy of Medicine | St Catharines |
| | Ontario Medical Association, Niagara South Medical Society, Niagara South Branch | Port Colborne |
| | Pharmacists' Association of the Niagara Peninsula | St Catharines |
 | Professional Hockey Players' Association | Niagara Falls |
 | Registered Nurses' Association of Ontario, Head Office | Toronto (City of) |
| | Registered Nurses' Association of Ontario, Niagara Chapter | Niagara Region |
| | Welland County Law Association, R Boak Burns Law Library | Welland |
| | Welland/Port Colborne Dental Association | Welland |