| NPCA | National Paint and Coatings Association 
| Others |
| NPCA | National Parks Conservation Association
| Others |
| NPCA | National Payment Card Association
| Others |
| NPCA | National Peace Corps Association
| Others |
| NPCA | National Philosophical Counseling Association
| Others |
| NPCA | National Pilot Car Association
| Others |
| NPCA | National Police Canine Association
| Others |
| NPCA | National Precast Concrete Association
| Others |
| NPCA | NEPAD Planning and Coordinating Agency
| Others |
| NPCA | Niagara Peninsula Conservation Authority
| Others |
| NPCA | Niagara Peninsula Conservation Authority [Ontario, Canada]
| Others |
| NPCA | Niagara Region Porsche Club of America
| Others |
| NPCA | Nissan Patrol Club Albuquerque
| Others |
| NPCA | Nissan Patrol Club America
| Others |
| NPCA | North Park Community Association
| Others |
| NPCA | Northwest Pennsylvania Collegiate Academy
| Others |
| NPCA | Northwest Presbyterian Christian Academy
| Others |
| NPCA | Norwegian Pollution Control Authority
| Others |
| NPCA | Nostalgia Pro Comp Association
| Others |