| New Developers Conference | Academic & Science |
| Nanded | Airport Code |
| National Data Corporation (delisted) | Business |
| NDCHealth Corporation | Business |
| Nitinol Devices & Components | Business |
| NENA Development Conference | Community |
| Norwegian Developers Conference | Community |
| Nuclear Development Committee | Community |
| Neighborhood Development Company | Community |
| Neighborhood Development Corporation | Community |
| Notre Dame Church | Community |
| Neighborhood Development Center | Community |
| Neighborhood Design Center | Community |
| International Symposium on New Directions in Computing | Community |
| National Destination Code (ITU) | Computer and Networking |
| Number of Direct Connections | Computer Hardware |
| Nested Diagnostic Context | Computer Hardware |
| New Distribution Capability | Computer Technology |
| National Datacomm Corporation | Computing |
| No Delete Code | Computing |
| Network Distributed Capi | Computing |
| Network Data Collection | Computing |
| Node Data Controller | Computing |
| Nationwide Direct Connect | Computing |
| National Data Centre | Computing |
| Network Defense and Countermeasures | Computing |
| Network Data Center | Computing |
| New Deal for Communities | Country Specific |
| National Data Center | Database Management |
| Notre Dame College | Educational Institute |
| Nissan Design Center | General |
| Nordic Drifting Championship | General |
| Nissan Design China | General |
| National Drivers Champions | General |
| National Dragster Challenge | General |
| National Desoto Club | General |
| Nurburgring Drift Cup | General |
| Nissan Dynamic Control | General |
| Nissan Datsun Chile | General |
| Nippon Datsun Club | General |
| Nested Diagnostic Contexts | General |
| National Declassification Center | General |
| National Data Collective | General |
| National Distribution Centre | General |
| New Dimension of Creative | General |
| Neurological Demands and Capacities | General |
| No Damn Cat | General |
| National Defence Complex | General |
| Noordelijke Dagblad Combinatie | General |
| NCR Direct Connect | General |
| Nationally Determined Contribution | General |
| NCR Direct Connection | General |
| Non Deterministic Choice | General |
| Nevada Deferred Compensation | General |
| National Deaf Center | General |
| Nike Dot Com | General |
| Nasty Dually Creator | General |
| National Driving Centre | Governmental |
| National Destination Code | Governmental |
| Naval Doctrine Command | Governmental |
| National Defense Council | Governmental |
| National Diving Council | Governmental |
| Nationally Determined Contributions | Governmental |
| National Develoment Council | Governmental |
| Nional Development Council | Governmental |
| National Diversity Council | Governmental |
| Normalized Device Coordinates | Governmental |
| No Direct Correspondence | Governmental |
| Not Done Counting | Governmental |
| Nuclear Disarmament Coalition | Governmental |
| National Development Council | Governmental |
| National Development Complex | Governmental |
| National Democratic Congress | Governmental |
| National Defence College | Indian Ministry of Defence Institution |
| National Dental Centre | Medical |
| National Drug Coalition | Medical |
| National Drug Codes | Medical |
| National Dairy Council | Medical |
| National Drug Code | Medical |
| National Drilling Company | Messaging |
| Nitinol Devices & Components | Messaging |
| Nato Defense College | Military and Defence |
| Network Domain Controller | Networking |
| Name Daemon Controller | Networking |
| National Defence Committee | Regional |
| Nanded, India | Regional |
| Ndau | Regional |
