| National Teachers College | Academic & Science |
| New Theological College | Academic & Science |
| Negative Temperature Coefficient | Academic & Science |
| Santa Carolina | Airport Code |
| National Telemanagement Corporation | Business |
| National Textile Corporation | Business |
| Nepal Telecommunications Corporation | Business |
| Netcomm Ltd | Business |
| Nebraska Transport Company | Business |
| Northern Trading Company | Business |
| Nuveen Connecticut Premium Income Municipal Fund | Business |
| Note Taking Club | Business |
| National Telecommunication Corporation | Business |
| National Textile Center | Business |
| National Technical Certification | Certifications |
| National Training Camp | Community |
| (Inter)National Telesystems Conference | Community |
| Nike Training Club | Community |
| New Teacher Center | Community |
| National Theatre for Children | Community |
| NASA Teleconferencing CenterNTC | Community |
| Nonprofit Technology Conference | Community |
| NAP Training Conference | Community |
| National Tripartite Committee | Community |
| North Texas Conference | Community |
| Northeast Technology Center | Computing |
| Nt Compatible | Computing |
| Network Transferable Computer | Computing |
| Network Troubleshooting Center | Computing |
| Near True Color | Computing |
| Nashville Technology Council | Computing |
| Novelties Technologies and Care | Computing |
| Nutanix Technology Champions | Computing |
| National Trade Certificate | Educational Degree |
| National Technical Certificate | Educational Degree |
| Northwest Technical College | Educational Institute |
| Northcentral Technical College | Educational Institute |
| Net Transfer Capacity | General |
| Nitto Team Challenge | General |
| Negative Thermal Coefficient | General |
| Numistrust Corporation | General |
| National Trumpet Competition | General |
| National Touch Championships | General |
| North Texas Commission | General |
| National Tasking CenterNTC | General |
| Nationale Topsport Centra | General |
| Non Template Control | General |
| Nationwide Title Clearing | General |
| National Targeting Center | General |
| Nox Trap Catalyst | General |
| Nissan Technical Center | General |
| National Transport Commission | General |
| National Team Championships | General |
| National Technicians Contest | General |
| National Tuner Club | General |
| Nebraska Transportation Company | General |
| Nissan Tiida Club | General |
| North Texas Chevelles | General |
| National Transportation Council | General |
| Nardo Technical Center | General |
| Nord Triumph Club | General |
| National Taxi Council | General |
| Non Turbo Charged | General |
| Nul Tiel Corpus | General |
| National Tariff Commission | General |
| Nihonmatsu Training Center | General |
| Name that Color | General |
| Nuclear Trained Community | General |
| Night time compensation | General |
| National Technical CoordinatorsNTC | General |
| Non Template Controls | General |
| National Tarriff Commission | Governmental |
| National Transitional Council | Governmental |
| National Transport Commission (Australia) | Governmental |
| Naval Training Center | Governmental |
| National Transportation Center | Governmental |
| Not True Children | Governmental |
| Network Technology Command | Governmental |
| Nebraska Transportation Center | Governmental |
| NASA Teleconferencing Center | Governmental |
| Nashville Tech Council | Governmental |
| Nutritional Therapy Council | Governmental |
| National Telecommunication Corproration (IR Pakistan) | Internet |
| Needed To Clear | Internet |
| Nutritional Therapy Consultant | Medical |
| Nuke The Chinks | Military and Defence |
| Naval Telecommunications Command | Military and Defence |
| National Training Center | Military and Defence |
| Nautical Training Corps | Military and Defence |
| Negative Temperature Coefficeint | Physics Related |
| Northern Territories Council | Regional |
| No Template Control | Softwares |
| National Tennis Center | Sports |
| National Tennis | Sports |
| National Trails Coalition (canada) | Sports |
| National Telecommunications Company | Telecommunication |
| National Telecommunications Commission | Telecommunication |