| N | North(ern) |
| NA | Not Authorised |
| NAAS | Naval Auxiliary Air Station |
| NADC | Naval Air Development Centre |
| NAEC | Naval Air Engineering Centre |
| NAF | Naval Air Facility |
| NALF | Naval Auxiliary Landing Field |
| NAM | North America (ICAO Region) |
| NAR | North American Routes for NAT traffic |
| NARL | Naval Arctic Research Laboratory |
| NAP | Noise Abatement Procedure |
| NAS | Naval Air Station (US) |
| NAT | North Atlantic (ICAO Region) |
| NAT/OTS | North Atlantic Traffic/Organised Track System |
| NATL | National |
| NAV | Navigation(al) |
| NAVAID | Navigational Aid |
| NB | North Bound |
| NCA | Northern Control Area (Canada) |
| NCRP | Non-Compulsory Reporting Point |
| NDB | Non-Directional Radio Beacon |
| NE | north-east |
| NEB | North-Eastbound |
| NEG | Negative |
| NGT | Night |
| NIL | No Item Listed |
| NM | Nautical Mile(s) |
| NML | Normal(ly) |
| NNE | North North East |
| NNW | North North West |
| No | Number |
| NOF | International Notam Office |
| NOPAC | North Pacific Route System |
| NoPT | No Procedure Turn |
| NOTAM | Notice to Airmen |
| NOV | November |
| NR | Number |
| NW | north-west |
| NWB | North-Westbound |
| NWC | Naval Weapon Centre |
| NWR | No Weight Restriction |
| NWS | North Warning System |
| NXT | Next |
