| Acronym | Meaning |
 | NPC | National Processing Centers |
| NPG | Naval Proving Ground |
| NPGATE | NCAR PROFS Gateway Computer |
| NPI | NEXRAD Product Interface |
| NPI | North Pacific Index |
| NPN | NOAA Profiler Network |
| NPOESS | National Polar Orbiter Environmental Satellite System |
| NPOP | NASA Polar Orbiting Platform |
| NPP | Net Primary Productivity |
| NPRM | Notice For Proposed Rule Making |
| NPS | Numerical Product Service |
| NPSNET | NASCOM Packet Switched Subnetwork |
| NQS | Network Queue System |
| NRC | National Research Council |
| NRCC | National Research Council Of Canada |
| NRDC | National Research Development Corporation |
| NRE | Notice Of Revised Estimate |
| NREL | National Resource Ecology Laboratory |
| NREL | National Renewable Energy Laboratory |
| NREN | National Research And Education Network |
| NRL | Naval Research Laboratory |
| NRLSI | National Reference Library Of Science And Invention |
| NRN | National Research Network |
| NROSS | Naval Remote Ocean Sensing System |
| NRSC | National Remote Sensing Centre |
| NS | Nanoseconds |
| NSB | National Science Board |
| NSBF | National Scientific Balloon Facility |
| NSC | Network Systems Corporation |
| NSCAT | NASA Scatterometer |
| NSDA | National Space Development Agency |
| NSDL | National Science Digital Library |
| NSF | National Science Foundation |
| NSFF | NSF Funded |
| NSFNET | National Science Foundation Network |
| NSFNF | Non-NSF Non-funded |
| NSG | Natural Systems Group |
| NSI | NASA Science Internet |
| NSIDC | National Snow And Ice Data Center |
| NSN | NASA Science Network |
| NSO | National Solar Observatory |
| NSPI | National Society For Programmed Instruction |
| NSRC | National Systems And Research Company |
| NSRDS | National Standard Reference Data System |
| NSS | Nodal Switching Subsystem |
| NSSDC | National Space Science Data Center |
| NSSFC | National Severe Storms Forecast Center |
| NSSL | National Severe Storms Laboratory |
| NSSP | National Severe Storms Project |
| NSTA | National Science Teachers Association |
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