| Nitrox Rebreather System | Academic & Science |
| Northern Research Station's | Academic & Science |
| Nathaniel Rochester Society | Academic & Science |
| Natural Resources Science | Academic & Science |
| National Rosacea Society | Academic & Science |
| Imperial Beach (ca) | Airport Code |
| Northwest River Supplies | Business |
| Nuclear Retention Signal | Chemistry |
| Non Resident Special | Community |
| Norwegian-Russian School | Community |
| Non Resident Studies | Community |
| New Residential Sales | Community |
| National Readership Survey | Community |
| Not Read Set | Computer Assembly Language |
| Name Registration Scheme | Computing |
| Noise Reduction System | Computing |
| Novell Replication Services | Computing |
| Network Routing Specialist | Computing |
| No-resonance System | Electronics |
| New Revenue Solutions | General |
| Nationwide Recovery Systems | General |
| National Reporting System | General |
| Nonlinear Random Schrodinger | General |
| Natural Reserve System | General |
| National Rental Services | General |
| National Runaway Switchboard | General |
| Normal Rubber Stamp | General |
| National Relay Service | General |
| Navigational Reference System | General |
| Recording Studio | General |
| Non Recoil Suppression | General |
| Nationwide Retirement Solutions | General |
| Network Reliable Systems | General |
| Northwest River Supply | General |
| NovaBACKUP Restore Script | General |
| No Replies | General |
| National Roper's Supply | General |
| Nonspecific Rabbit Serum | General |
| National Runaway Safeline | General |
| New Resistive Switching | General |
| Nozh Razvedchika Strelyayushiy | General |
| Network Routing Solution | General |
| Ranch Store | General |
| National Registration System | General |
| Non Rising Stem | General |
| National Reservation System | General |
| National Retail Solutions | General |
| Naval Radio Station | General |
| Natural Resources Section | General |
| Neighborhood Revitalization Strategy | General |
| National Response System | General |
| Nutrition Risk Screening | General |
| Natural Resource Section | General |
| NATO Range Safety | General |
| Nox Reduction System | General |
| National Roadster Show | General |
| Natural Reclamation System | Governmental |
| Navy Reporting System | Governmental |
| National Records of Scotland | Governmental |
| National Relay Services | Governmental |
| National Regulatory Services | Governmental |
| Nevada Revised Statutes | Governmental |
| NAGARIA SADAT | Indian Railway Station |
| Nehemiah Reuben Salo | International |
| New Russian Standard | International |
| Not Ready Strange | Internet |
| Networking and Referrals Unlimited | Jobs |
| Numeric Rating Scale | Maths |
| Numerical Rating Scale | Medical |
| Northern Research Station | Medical |
| Neuron- Restrictive Silencer | Medical |
| Normal Rabbit Serum | Medical |
| No Registry Search | Networking |
| Nuclear Reaction Spectrometry | Physics Related |
| Nearctic Regional Section | Regional |
| National Railway Supplies | Regional |
| Norstar Remote Utilities System | Softwares |
| New Revised Standard | Space Science |
| Nonconformance Reporting System | Space Science |
