| Abbreviation | Definition |
|---|---|
| NSTISSP | National Security Telecommunications and Information Systems Security Policy |
| NSTL | National Security Threat List |
| NSTP | National Service Training Program |
| NSVRP | National Salvage Vehicle Reporting Program |
| NSWBC | National Security Whistleblowers Coalition |
| NT | Newer Technology |
| NTA | Non-Technical Acronym |
| NTAS | National Terrorism Advisory System |
| NTB | National Treasury Bill |
| NTDB | National Trauma Data Bank |
| NTPEEC | National Target Program on Energy Efficiency and Conservation |
| NTR | National Tax Rebate |
| NTSB | National Transport Safety Board |
| NTSC | National Television System Committee |
| NTT | National Technological Training |
| NTTAA | National Technology Transfer and Advancement Act |
| NU | Non Us |
| NUAI | National Unity Against Imperialism |
| NUAP | National Unity Advisory Panel |
| NUMA | National Underwater And Marine Agency |