| Pakmen Volleyball Club | Milton |
| Palms Medical Centre, Family Medicine and Walk-in Clinic | Oakville |
| Parachute | Toronto |
| Parkside Rest Home, Group home | Halton Hills |
| Parole Board of Canada, Victim Information Service | Ottawa |
| PCHS, PCHS Brampton | Brampton |
| PCHS, PCHS Mississauga | Mississauga |
| Pediatric Plus, Burlington, Walk-in Medical Clinic | Burlington |
| Pediatric Urgent Care, Walk-in Medical Clinic | Oakville |
| Period Pin | Ontario |
| Pflag Canada, Pflag Halton | Milton |
| Phoenix Medical Centre, Addictions and Recovery Clinic | Clarkson |
| PKD Foundation of Canada | Etobicoke |
| Polish National Union of Canada | Burlington |
| Polycultural Immigrant and Community Services, Mississauga Office, Polycultural Immigrant and Community Services, Mississauga Office | Mississauga |
| Port Nelson United Church | Burlington |
| Positive Health Network, Oakville - Kerr St, Supports, Education and Training | Oakville |
| Postmaster Medical Clinic, Family Practice and Walk-in Clinic | Oakville |
| Postpartum Support International, Postpartum Mood Disorder Services | Toronto |
| Prime Care After Hours Walk-in Clinic | Milton |
| Prime Care Family Health Team - Gender Care Clinic | Milton |
| Prime Earth, Youth Empowerment & Environmental Conservation Organization | Burlington |
| PRISM Halton | Halton Region |
| Pro Bono Ontario, Canadian Legal Support for Ukrainians | Toronto |
| Project Autism Canada | Halton Region |
| Protecting Escarpment Rural Land | Burlington |
| Psychiatric Patient Advocate Office, Patient Advocacy, Education and Information | Toronto |
