| Neurological Society of India | Academic & Science |
| Network For Student Information | Academic & Science |
| The Neurosciences Institute | Academic & Science |
| Net Sales Income | Accounts and Finance |
| Yaounde | Airport Code |
| New Star Inv | Business |
| Nova Scotia Power Incorporated (de-listed) | Business |
| Naval Systems Inc | Business |
| Nearfield Systems Inc | Business |
| Nuance Systems Inc | Business |
| North Shore Inc | Business |
| Network Solutions Inc | Business |
| Next Solutions Inc | Business |
| National Service Industries, Inc. | Business |
| Net Spendable Income | Business |
| Network Solutions Incorporated | Business |
| National Sportswear, Inc. | Business |
| Nail Systems International | Business |
| National Science Institute | Community |
| Next Sequential Instruction | Computer Assembly Language |
| Norton System Information | Computing |
| Name Service Interface | Computing |
| Non Sna Interconnection | Computing |
| Network Side Interface | Computing |
| Network System Interface | Computing |
| Network Store Interface | Computing |
| Network Store Information | Computing |
| Name Service Independent | Computing |
| nSights DeFi Trader | Cryptocurrency |
| National Security Inspectorate | General |
| Nationwide SAR Initiative | General |
| Network System Integrators | General |
| No Smoking Indoors | General |
| National Security Information | General |
| Non Standard | General |
| Network Spread Index | General |
| National Strategic Indicators | General |
| Nitrogen Solubility Index | General |
| Navistar Service Information | General |
| National Security Institute | Governmental |
| Non Standard Institute | Governmental |
| National Screen Institute | Governmental |
| North South Institute | Governmental |
| National Security Intelligence | Governmental |
| National Shipbuilding Initiative | Governmental |
| National Savings Institute | Indian Ministry of Finance |
| NIKURSINI | Indian Railway Station |
| Not So Important | Internet |
| Negotiated Salary Increase | Jobs |
| neuropsychological Symptom Inventory | Medical |
| Neurobehavioral Symptom Inventory | Medical |
| No Sign of Infection/Inflammation | Medical |
| Neural Sensory Inducer | Medical |
| Numeric System Identifier | Military and Defence |
| Not Seriously Injured | Military and Defence |
| Nutrition Society of India | Ministry of Health and Family Welfare Organization |
| Nsimalen, Cameroon | Regional |
| Netscape Interface | Softwares |
| Nexwave Software Infrastructure | Softwares |
| Nasa Science Internet | Space Science |
| Newport, Sammamish, Interlake, | Sports |
| Natural Selection Invitational | Sports |
| Nail Systems Icn | Sports |
| Network Service Interface | Telecommunication |
