| NAS | Network-Attached Storage |
| NASM | National Academy Of Sports Medicine |
| NAV | Net Asset Value |
| NBN | National Broadband Network |
| NEA | National Education Association |
| NEAT | National Educational Alliance For Technology |
| NFAS | National Feedlot Accreditation Scheme |
| NFIB | National Federation Of Independent Business |
| NGO | Non-Governmental Organization |
| NHS | National Health Service |
| NIB | National Institute Of Biologicals |
| NIST | National Institute Of Standards And Technology |
| NJO | New Jersey Online |
| NMD | Naturopathic Medical Doctor / Nomad / National Missile Defense |
| NMS | Network Management System |
| NNN | Triple Net Lease |
| NOMINAL | |
| NORTON | Norton By Symantec |
| NP | Nurse Practitioner |
| NPS | National Pension System / Net Promoter Score |
| NRCC | National Research Centre On Camel |
| NRG | Non-Resident Government / New Rave Generation |
| NRI | Non Resident Indian |
| NRMA | National Roads And Motorists' Association Limited |
| NSO | National Statistical Office |
| NTB | Non-Tariff Barrier / New To Bank |
| NTM | Nontuberculous Mycobacteria |
| NTTS | National Truck And Trailer Services |
| NUMX | Numex Corporation |