| Nitro Triacetic Acid | Academic & Science |
| Nifty Trading Academy | Academic & Science |
| National Test Academy | Academic & Science |
| IEEE Nikola Tesla Award | Academic & Science |
| National Teachers Academy | Academic & Science |
| Net Tangible Assets | Accounts and Finance |
| Natadola | Airport Code |
| Talent Agency | Business |
| National Tour Association | Business |
| National Taxidermists Association | Business |
| National Textile Association | Business |
| National Tax Association | Business |
| National Technologies Associates, Incorporated | Business |
| National Training Agency | Business |
| National Tax Agency | Business |
| National Testing Agency | Business |
| National Trappers' Association | Business |
| National Test Agency | Business |
| Nutritional Therapist Association | Business |
| National Tourism Agency | Business |
| Northacre, P.L.C. | Business |
| Noventa, Limited | Business |
| Nunavut Teachers' Association | Business |
| Nitrilotriacetic Acid | Chemistry |
| National Technical Association | Community |
| Nippon Travel Agency | Community |
| National Teachers Associates | Community |
| Nutritional Therapy Association | Community |
| National Tutoring Association | Community |
| National Teachers Association | Community |
| National Transition Alliance | Community |
| National Teacher Associates | Community |
| National Television Association | Community |
| National Translator Association | Community |
| Nigerian Television Authority | Community |
| New Testament Abstracts | Community |
| Newburgh Teachers' Association | Community |
| National Technologies Associates | Computing |
| NIEHS Trainees Assembly | Computing |
| Network Traffic Analysis | Computing |
| National Technology Associates | Computing |
| Navigation Technology Associates | Computing |
| National Timing Authority | Computing |
| No Temporary Register Available | Computing |
| Network Tree Allocator | Computing |
| Network Traffic Analyzer | General |
| New Ticket Automaten | General |
| Northern Training Area | General |
| National Team Administrator | General |
| Nationwide Tire Auto | General |
| Next To Arrive | General |
| Nanoparticle Tracking Analysis | General |
| Not This Again | General |
| Non Tangentially Accessible | General |
| Nerd Team Awesome | General |
| National Thing Alliance | General |
| New Transatlantic Arguing | General |
| Near Term Actions | General |
| Nothing to Add | General |
| Notice The Armor | General |
| Net Tangible Asset | General |
| Number Of Total Answers | General |
| Neutral Torque Axis | General |
| National Type Approval | General |
| Not That Amazing | General |
| Nodo Tetti Apribili | General |
| National Taxi Association | General |
| National Truckers Association | General |
| Nevada Trucking Association | General |
| No Throwers Allowed | General |
| Northamerican Transportation Association | General |
| Nebraska Trucking Association | General |
| Neighborhood Tabulation Areas | General |
| National Taxi Alliance | General |
| Non Temporal A | General |
| National Transfer Accounts | General |
| NetFlow Traffic Analyzer | General |
| National Transport Authority | Governmental |
| Norwalk Tree Alliance | Governmental |
| Nepal Telecommunications Authority | Governmental |
| Nigeria Television Authority | Governmental |
| National Thug Association | Governmental |
| No Torque At | Governmental |
| Non-Technical Acronym | Governmental |
| Ninja-Type Assassin | Governmental |
| Notice To Appear | Governmental |
| Notice To Applicants | Governmental |
| Nevada Transportation Authority | Governmental |
| NETRA | Indian Railway Station |
| Naughty Tennant A** | Internet |
| Not The *sshole | Internet |
| Notices To Appear | Internet |
| Natural Therapy Advice | Medical |
| Non Therapy Ancillary | Medical |
| National Tax Agency ( Japan) | Regional |
| Natadola, Fiji | Regional |
| National Tennis Academy | Sports |
| National Telecom Alliance | Telecommunication |
| Nebraska Telecommunications Association | Telecommunication |
