| NPSS | Nana Palkar Smruti Samiti 
| Others |
| NPSS | National Pediatric Support Services, Inc.
| Others |
| NPSS | National Port Said Steel
| Others |
| NPSS | National Practitioner Support Service
| Others |
| NPSS | National Predictive Service Subcommittee
| Others |
| NPSS | National Public Safety Solutions
| Others |
| NPSS | Native Plant Society of Saskatchewan
| Others |
| NPSS | Natural Products Sterilization Services
| Others |
| NPSS | Nature Photographic Society Singapore
| Others |
| NPSS | Nature Photographic Society, Singapore
| Others |
| NPSS | Next Phase Solutions and Services
| Others |
| NPSS | Nitro Piston Short Stroke
| Others |
| NPSS | Nitrogen Piston Short Stroke
| Others |
| NPSS | Non Placement Support Services
| Others |
| NPSS | Non Prescription Sale of Syringes
| Others |
| NPSS | Non Public School Services
| Others |
| NPSS | Non-Personnel Security Specialist
| Others |
| NPSS | Non-Public School Services
| Others |
| NPSS | Norman Park State School
| Others |
| NPSS | North Park Secondary School
| Others |
| NPSS | North Peace Secondary School
| Others |
| NPSS | Northeast Product Safety Society
| Others |
| NPSS | Nottawasaga Pines Secondary School
| Others |
| NPSS | Nuclear and Plasma Science Society
| Others |
| NPSS | Nuclear and Plasma Sciences Society
| Others |
| NPSS | Nuclear Physics Summer School
| Others |
| NPSs | Nuclear Power Sources
| Others |
| NPSS | Numerical Propulsion System Simulation
| Others |