| NASA | National Aeronautics And Space Administration | - | Scuba Diving |
| NASDA | National Space Development Agency (Japan) | - | Scuba Diving |
| NCAR | National Center For Atmospheric Research | - | Scuba Diving |
| NCDC | National Climatic Data Center | - | Scuba Diving |
| NCEP | National Centers For Environmental Prediction (form. NMC; NWS Center) | - | Scuba Diving |
| NESDIS | National Environmental Satellite | - | Scuba Diving |
| NEXRAD | NEXt Generation RADar | - | Scuba Diving |
| NOAA | National Oceanic And Atmospheric Administration | - | Scuba Diving |
| NOAASIS | NOAA Satellite Information System | - | Scuba Diving |
| NPOESS | National Polar-orbiting Operational Environmental Satellite System | - | Scuba Diving |
| NWS | National Weather Service (NOAA) | - | Scuba Diving |
