| Northern Territory Library | Academic & Science |
| NonStop Technical Library | Academic & Science |
| Normal Tidal Limit | Academic & Science |
| Newton's Third Law | Academic & Science |
| Number Theory Library | Academic & Science |
| Nippon Techno Lab, Inc. | Academic & Science |
| National Taichung Library | Academic & Science |
| Neural Theory of Language | Academic & Science |
| Nuclear Technology Laboratory | Academic & Science |
| Notified Testing Laboratory | Academic & Science |
| Non-Uniform Transmission Line | Academic & Science |
| Neon Test Light | Academic & Science |
| Nuclear Thermionics Laboratory | Academic & Science |
| Non-Trucking Liability | Business |
| National Travelers Life Company | Business |
| Newfoundland Transshipment Limited | Business |
| Nelson, Tyler, and Langer, PLLC | Business |
| Network Technologies, Limited | Business |
| National Transmitters Limited | Business |
| Nortel Inversora, S. A. | Business |
| No Time Limit | Business |
| Notice(s) to Lessees | Business |
| Norsk Tjenestemannslag | Community |
| Norske Tropefuglforeningers Landsforbund (Norwegian bird association) | Community |
| National Temperance League | Community |
| National Trust Library | Community |
| North Twin Lakes Elementary School | Community |
| National City Lines, Inc. | Community |
| Not Too Long | Computing |
| Non-standard Template Library | Computing |
| No Technology Limit | Computing |
| NASA Tournament Lab | General |
| National Track League | General |
| North Temperate Lakes | General |
| Trust Limited | General |
| Naigai Trans Line | General |
| Need to Talk Live | General |
| Next To Leading | General |
| N Time Levels | General |
| Neighborhood Team Leader | General |
| Nevertheless | General |
| Notice to Lessees and Operators | General |
| Need The Loo | General |
| Nizky Tlak (Czech: Low Pressure) | General |
| Newfangled Transfer Limitations | General |
| Nice Television Love | General |
| The Next To Leading | General |
| Naughty Telephone Line | General |
| Non-Technological Liability | General |
| National Transportation Library | General |
| National Tow List | General |
| Nissan Tiida Latio | General |
| Nothing To Lose (movie) | General |
| National Trial Lawyers | Governmental |
| National Transportation Library's | Governmental |
| National Transit Library | Governmental |
| North Twin Lakes | Governmental |
| National Testing Laboratory | Governmental |
| Nutella | Internet |
| Navigating The Library | Internet |
| Number Theory Language | Maths |
| Not Today, Love | Messaging |
| No Telephone, Love | Messaging |
| Not Tremendously Lovely | Messaging |
| None The Less | Messaging |
| Nothing To Lose | Military and Defence |
| Nawips Top Level | Military and Defence |
| National Training Laboratories | Military and Defence |
| Northwest Transmission Line | Regional |
| National Transcommunications Limited | Regional |
| Newcastle, New South Wales, Australia - Williamtown (Airport Code) | Regional |
| Next To Link | Regional |
| Williamstown Airport, Newcastle, New South Wales, Australia | Regional |
| Netball Talent League | Sports |
| Not Tournament Legal | Sports |
| No Technology Limits | Technology |
| Northern Telecomminications Line | Telecommunication |
| No Telephone Line | Telecommunication |
| Nokia Telecommunication Limited | Telecommunication |
