| Abbreviation | Definition |
|---|---|
| NAEMB | National Academy of Engineering Marine Board |
| NAFO | North-West Atlantic Fisheries Organization |
| NAFTA | North American Free Trade Agreement |
| NAO | NOAA Administrative Order |
| NAPA | Naval Architectural PAckage |
| NAPAP | National Acid Precipitation Assessment Program |
| NARA | National Aquatic Resources Agency |
| NARE | North Atlantic Regional Experiment |
| NAS | National Academy of Sciences |
| NAS | Non-indigenous Aquatic Species |
| NAS/NAE-SECAN | National Academy Of Sciences/ National Academy Of Engineering Science and Engineering Committee Advisory to NOAA |
| NAS/OAB | National Academy of Sciences Ocean Affairs Board |
| NASC | North Atlantic Salmon Convention |
| NASCO | National Academy of Sciences Committee on Oceanography |
| NASS | North Atlantic Sightings Survey |
| NAT | North Atlantic Tour |
| NATO | North American Treaty Organization |
| NAVAID | Navigational Aid |
| NAVAIR | Naval Air Systems command headquarters |
| NAVD88 | North American Vertical Datum of 1988 |