| Abbreviation | Definition |
|---|---|
| NARFE | National Active and Retired Federal Employees Association |
| NARFE | National Association of Retired Federal Employees |
| NARUC | National Association of Regulatory Utility Commissioners |
| NAS | No Active Support |
| NAS | Non Action System |
| NAS | North American Specification |
| NASN | National Association of School Nurses |
| NASP | Naval Activities Support Program |
| NASS | National Association of Secretaries of State |
| NATA | National Anti Terrorist Association |
| NAUC | North American Unity Council |
| NAVD | North American Vertical Datum |
| NAWAS | National Attack Warning Alert System |
| NAWQA | NAtional Water Quality Assessment |
| NAY | No vote |
| NAZ | Name Address And Zip |
| NB | National Battlefield |
| NB | National Board |
| NBAC | National Bioethics Advisory Commision |
| NBACC | National Biodefense Analysis and Countermeasures Center |