| | Organization Name(s) | Located In |
 | Paderewski Society Home | St Catharines |
 | Paramed Home Health Care | Niagara-on-the-Lake |
 | Paratransit System of St Catharines, Transportation for the Physically Challenged | St Catharines |
 | Pardons Canada, Criminal Records Removed | Toronto (City of) |
| | Parent Teen Tug of War - Conflict Resolution Services | St Catharines |
| | Parents for Childrens Mental Health, Niagara Chapter | St Catharines |
 | Parents Peace of Mind Childcare, Merritt St, St Catharines | St Catharines |
 | Parents Peace of Mind Childcare, St Paul St W, St Catharines | St Catharines |
| | Parkinson Niagara | Niagara Region |
 | Parkinson Society Central & Northern Ontario, Niagara Chapter | Toronto (City of) |
 | Pathstone Mental Health, Schmon Parkway, Mobile Intensive Treatment Team (MITT) and Family Preservation Program (FPP) | Thorold |
 | Pathstone Mental Health, Schmon Parkway Site, Administration | Thorold |
 | Pathstone Mental Health, Schmon Parkway Site, Assessment and Intensive Services | Thorold |
 | Pathstone Mental Health, Schmon Parkway Site, Clinical Assessment Services | Thorold |
 | Pathstone Mental Health, Schmon Parkway Site, Crisis Services | Thorold |
 | Pathstone Mental Health, Schmon Parkway Site, High Risk Services | Thorold |
 | Pathstone Mental Health, Schmon Parkway Site, Psycho-Educational Assessments | Thorold |
 | Pathstone Mental Health, Schmon Parkway Site, Residential Services (Residential Treatment) | Thorold |
 | Pathstone Mental Health, Schmon Parkway Site, Workshops for Parents and Professionals | Thorold |
 | Pathstone Mental Health, Welland Site | Welland |
 | Pathstone Mental Health, Welland Site, Children and Youth Groups | Welland |
 | Pathstone Mental Health, Welland Site, Counselling Services | Welland |
 | Pathstone Mental Health, Welland Site, Day Treatment Services | Welland |
 | Pathstone Mental Health, Welland Site, Divorce and Separation Services | Thorold |
 | Pathstone Mental Health, Welland Site, Early Years Programs | Welland |
 | Pathstone Mental Health, Welland Site, Niagara Preschool Resource Service | Welland |
 | Pathstone Mental Health, Welland Site, Supervised Visitation and Exchange Niagara Program | Welland |
 | Pathways Academy and Early Learning Centre | Niagara Falls |
| | Pathways to Peace, (Canada), Niagara | St Catharines |
 | Pearl Nannies and Domestic Agency | St Catharines |
 | Pediatric and Adult Walk-In Clinic | St Catharines |
 | Pelham Art Association, Art Workshops | Fonthill |
 | Pelham Cares Inc | Fonthill |
 | Pelham Community Church | Fenwick |
| | Pelham Historical Society, The | Pelham |
 | Pelham News | Welland |
 | Pelham Non Profit Housing Corporation, Pelham Seniors Apartments | Fonthill |
| | Pelham Panthers Basketball Association | Pelham |
 | Pelham Public Library, Fonthill Branch | Fonthill |
 | Pelham Public Library, Maple Acre Branch | Fenwick |
 | Pelham Public Library, Summer Programs | Fonthill |
 | Pelham Senior Citizen's Association | Ridgeville |
 | Pelham Walk-in Clinic | St Catharines |
 | Pelham. Town Of | Fonthill |
| | Pelham. Town Of, Arenas, Pools and Recreation Facilities | Pelham |
 | Pelham. Town Of, Municipal - Elected Officials | Fonthill |
 | Pelham. Town of, Recreation, Culture & Wellness | Fonthill |
 | Pelham. Town Of, Recreation, Culture & Wellness, Summer Camps | Fonthill |
 | Pen Centre Mall Walkers | St Catharines |
| | Penguin Club | Niagara-on-the-Lake |
| | Peninsula Country and Western Club | St Catharines |
| | Peninsula Field Naturalists Club | St Catharines |
| | Peninsula Orchestra | Fonthill |
| | Peninsula Paddlers Kayaking Club | St Catharines |
 | Peninsula Youth Centre | Fenwick |
 | Penny Doncaster, Occupational Therapy Services | Niagara Falls |
 | Penny J Bowers Massage and Reflexology Therapy | St Catharines |
 | Peoples Memorial United Church | Ridgeway |
 | Performance School of Music & Dance | St Catharines |
 | Personal Optical | St Catharines |
 | Peterson Community Workshop Association (Chippawa) | Niagara Falls |
 | Pettit Avenue Nursery School | Niagara Falls |
| | PFLAG Canada | Moncton |
 | PFLAG Canada, Niagara Chapter | St Catharines |
| | Pharmacists' Association of the Niagara Peninsula | St Catharines |
 | Philips Lifeline | Toronto |
| | Pilot Club of Niagara Falls | Niagara Falls |
 | Pioneer Elder Care | St Catharines |
| | PK Hummingbird Steel Orchestra | Thorold |
 | Pleasant Manor Retirement Village | Virgil |
 | Plymouth Cordage Retirement Community | Welland |
| | Plymouth Park Soccer League | Welland |
 | POINTTS - TheTraffic Ticket Specialists, St Catharines | St Catharines |
 | Polish Combatants Association - Branch 27 | St Catharines |
| | Population of the Niagara Region | Niagara Region |
 | Port Cares | Port Colborne |
 | Port Cares, Client Services | Port Colborne |
 | Port Cares, Employment Centre, Ontario Employment Services | Port Colborne |
 | Port Cares, Niagara Youth Justice Committee | Port Colborne |
 | Port Cares, Reach Out Food Centre | Port Colborne |
 | Port Cares, The Learning Centre | Port Colborne |
 | Port Colborne - Wainfleet Chamber of Commerce | Port Colborne |
 | Port Colborne - Wainfleet Chamber of Commerce, Port Colborne Visitor's Information Centre | Port Colborne |
 | Port Colborne and District Conservation Club | Port Colborne |
| | Port Colborne Art Club | Port Colborne |
 | Port Colborne Baptist Church | Port Colborne |
 | Port Colborne Brethren in Christ Church | Port Colborne |
| | Port Colborne Concert Band | Port Colborne |
 | Port Colborne Economic Development, Tourism & Marketing | Port Colborne |
| | Port Colborne Feline Initiative | Port Colborne |
 | Port Colborne Historical and Marine Museum | Port Colborne |
 | Port Colborne Leader | Port Colborne |
 | Port Colborne Minor Baseball | Port Colborne |
| | Port Colborne Music Club, The | Port Colborne |
| | Port Colborne Operatic Society | Port Colborne |
 | Port Colborne Public Library | Port Colborne |
 | Port Colborne Public Library, Summer Program | Port Colborne |
 | Port Colborne Regional Child Care Centre | Port Colborne |
 | Port Colborne Saddle Club | Port Colborne |
 | Port Colborne Tennis Club | Port Colborne |
 | Port Colborne. City Of | Port Colborne |
| | Port Colborne. City Of, Arenas, Pools and Recreaton Facilities | Port Colborne |
 | Port Colborne. City Of, Community Services | Port Colborne |
 | Port Colborne. City Of, Municipal - Elected Officials | Port Colborne |
 | Port Colborne. City Of, Port Colborne Transit | Port Colborne |
 | Port Colborne. Corporate and Community Services, Community Services, Bethel Community Centre | Port Colborne |
 | Port Colborne. Corporate and Community Services, Community Services, Sherkston Community Centre | Sherkston |
| | Port Colborne/Welland and District Shrine Club | Port Colborne |
 | Port Dalhousie Business Association | St Catharines |
 | Port Dalhousie Canadian Power and Sail Squadron | St Catharines |
 | Port Dalhousie Canadian Power and Sail Squadron, Winter 2012 Boating Courses | St Catharines |
 | Port Dalhousie Co-op Nursery School Inc | St Catharines |
 | Port Dalhousie Lawn Bowling Club | St Catharines |
 | Port Dalhousie Older Adult Centre | St Catharines |
 | Port of Grace Community Church | Port Colborne |
 | Port Weller Soccer League | St Catharines |
 | Portage Medical Family Health Team | Niagara Falls |
 | Portage Walk-in Clinic | Niagara Falls |
 | Portal Village Bible Chapel | Port Colborne |
 | Portal Village Retirement Home and Garden Terrace Complex | Port Colborne |
| | Positive Step, The | St Catharines |
 | PoultryFest Niagara | Smithville |
 | Power Glen Co-op Nursery School Inc | St Catharines |
 | Powerhouse Project, Young Carers Initiative | St Catharines |
 | Precision Custom Welding | Welland |
 | Prenatal Network of Niagara | Thorold |
| | Preservation of Agricultural Lands Society | St Catharines |
| | President's Choice Children's Charity, Financial Assistance and Breakfast for Learning | Brampton |
 | Prima Care Living Solutions, The Henley House | St Catharines |
 | Primary Care Niagara, Niagara Falls | Niagara Falls |
 | Primary Care Niagara, Welland | Welland |
 | Primavera Concerts | St Catharines |
| | Pro Bono Law Ontario, Volunteer Lawyers Service | Toronto |
| | Probus Club of Niagara East | Niagara Falls |
| | Probus Club of St Catharines | St Catharines |
 | Pro-Cathedral of St Luke, Ecumenical Catholic Church of Christ | Niagara Falls |
 | Professional Hockey Players' Association | Niagara Falls |
| | Project Lifesaver Niagara | Welland |
| | Project Linus | Fort Erie |
 | Project Share | Niagara Falls |
| | Project Smile Niagara | St Catharines |
| | Promoting Awareness of RSD/CRPS in Canada | St Catharines |
 | Promoting Relationships and Eliminating Violence Network | Kingston |
 | Prompt Doc Urgent Care Clinic | St Catharines |
 | Providence Christian Reformed Church | Beamsville |
 | PT Health | Hamilton (City of) |