| Acronym | Meaning |
 | NQOCD | Not Quite Our Class |
| NR | Nauru (ISO 3166 And FIPS 10-4 Country Code Digram) |
| NR | Southern Ndebele Language (ISO 639-1 Code) |
| NRA | National Rifle Association |
| NRAO | National Radio Astronomy Observatory |
| NRC | National Research Council (U.S.) - Nuclear Regulatory Commission (U.S.) |
| NRDC | (U.S.) Natural Resources Defense Council |
| NREL | U.S. National Renewable Energy Laboratory |
| NRK | Norsk Rikskringkasting (Norwegian Broadcasting Corporation) |
| NRO | U.S. National Reconnaissance Office |
| NRT | Near Real Time |
| NRTA | National Thoroughbred Racing Association - National Rat Terrier Association - National Retail Tenants Association - National Retired Teachers Association - Northwest Regional Transmission Association |
| NRU | Nauru (ISO 3166 Trigram) |
| NS | Nanosecond |
| NS | Nanosiemens |
| NS | Nova Scotia (postal Symbol) - Suriname (FIPS 10-4 Country Code) |
| NSA | U.S. National Security Agency - Naval Support Activity - No Strings Attached |
| NSABB | National Science Advisory Board For Biosecurity |
| NSAID | Non-Steroidal Anti-Inflammatory Drug |
| NSB | Norges Statsbaner (Norwegian State Railways) |
| NSDAP | Nationalsozialistische Deutsche Arbeiterpartei (German: German National Socialist Workers Party |
| NSG | National System For Geospatial-Intelligence |
| NSN | National Stock Number |
| NSO | National Standardization Office (ABCA) |
| NSS | (U.S.) Naval Simulation System |
| NST | (UK) Nimrod Software Team |
| NSTAC | National Security Telecommunications Advisory Committee |
| NSW | New South Wales (postal Symbol) |
| NT | Iraq-Saudi Arabia Neutral Zone (ISO 3166 Digram; Obsolete 1993) - Northern Territory (Australia) (postal Symbol) - Northwest Territories (Canada) (postal Symbol) - National Trust (UK) |
| NT | Nanotesla |
| NTC | National Training Center - Negative Temperature Coefficient (thermistor) |
| NTDS | Naval Tactical Data System |
| NTP | Network Time Protocol |
| NTR | Network Time Reference |
| NTSB | National Transportation Safety Board |
| NTSC | National Television Standards Committee (colloquially |
| NTV | Non-Tactical Vehicle |
| NTZ | Iraq-Saudi Arabia Neutral Zone (ISO 3166 Trigram; Obsolete 1993) |
| NU | Nicaragua (FIPS 10-4 Country Code) - Niue (ISO 3166 Digram) - Nunavut (postal Symbol) |
| NUCC(C) | Nordic University Computer Club (Conference) |
| NUL | Null Character (ASCII Code Of Control Character) - National Urban League |
| NUTS | Nuclear Utilization Target Selection |
| NUWC | U.S. Naval Undersea Warfare Center |
| NV | Nanovolt |
| NV | Navajo Language (ISO 639-1 Code) |
| NV | Nevada (postal Symbol) |
| NVEOL | Night Vision And Electro-Optics Laboratory |
| NVESD | Night Vision And Electronic Sensors Directorate |
| NVG | Night Vision Goggles |
| NVL | Night Vision Laboratory |
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