| N | Neutrons | - | Organizations |
| N | Newton | - | Organizations |
| N | North | - | Organizations |
| N&G | Navigation And Guidance (G&N Preferred) | - | Organizations |
| N/0 | Normally Open | - | Organizations |
| N/A | Next Assembly | - | Organizations |
| N/A | Not Applicable | - | Organizations |
| N/B | Narrow Band | - | Organizations |
| N/C | Normally Closed | - | Organizations |
| N/C | Nose Cone | - | Organizations |
| N/C | Not Critical | - | Organizations |
| N/C | Numerical Control | - | Organizations |
| N/D | Need Date | - | Organizations |
| N/P | Not Provided | - | Organizations |
| N/W | Network | - | Organizations |
| N02 | Nitrogen Dioxide | - | Organizations |
| N2 | Nitrogen | - | Organizations |
| N2 | Nitrogen | - | Organizations |
| N204 | Nitrogen Tetroxide | - | Organizations |
| N2H4 | Hydrazine | - | Organizations |
| N2HO4 | Nitrogen Peroxide | - | Organizations |
| N2O4 | Nitrogen Tetroxide | - | Organizations |
| NA | Next Action | - | Organizations |
| NA | Not Applicable | - | Organizations |
| NAAL | North American Aerodynamic Laboratory (Wind Tunnel) | - | Organizations |
| NAC | Nacelle | - | Organizations |
| NAEC | Naval Air Engineering Center | - | Organizations |
| NAM | National Association Of Manufacturers | - | Organizations |
| NAP | Navigation Analysis Program | - | Organizations |
| NAR | Numerical Analysis Research | - | Organizations |
| NARS | National Archives And Record Services | - | Organizations |
| NAS | National Academy Of Sciences | - | Organizations |
| NAS | National Aircraft Standard | - | Organizations |
| NAS | Naval Air Station | - | Organizations |
| NASA | National Aeronautics And Space Administration | - | Organizations |
| NASA | National Aeronautics And Space Administration | - | Organizations |
| NASCOM | NASA Communications (Network) | - | Organizations |
| NASCOM | NASA Communications Network | - | Organizations |
| NASTRAN | NASA Structural Analysis | - | Organizations |
| NATF | Naval Air Test Facility | - | Organizations |
| NATL | National | - | Organizations |
| NAV | Navigate | - | Organizations |
| NAVAID | Navigation Aid | - | Organizations |
| NAVDAD | Navigationally Derived Air Data | - | Organizations |
| NAVPOOL | Navigation Parameter Common Pool | - | Organizations |
| NAVSAT | Navigation Satellite | - | Organizations |
| NB | Narrow Band | - | Organizations |
| NB | Navigation Base | - | Organizations |
| NB | Niobium | - | Organizations |
| NB | Nitrogen Base | - | Organizations |
| NB | No-Bias (Relay) | - | Organizations |
| NBF | Neutral Buoyancy Facility | - | Organizations |
| NBS | National Bureau Of Standards | - | Organizations |
| NBT | Neutral Buoyancy Trainer | - | Organizations |
| NC | National Course | - | Organizations |
| NC | No Comment | - | Organizations |
| NC | No Change | - | Organizations |
| NC | Noise Criteria | - | Organizations |
| NC | Normally Closed | - | Organizations |
| NC | Normally Closed | - | Organizations |
| NC | Numerical Control | - | Organizations |
| NC1 | Nominal Correction 1 (Phasing Maneuver) | - | Organizations |
| NCC | NASA Class Code | - | Organizations |
| NCC | Network Control Center (GSFC) | - | Organizations |
| NCC | Nominal Corrective Combination (Maneuver) | - | Organizations |
| NCGS | Nuclear Criteria Group Secretary | - | Organizations |
| NCI | Phasing Maneuver | - | Organizations |
| NCIU | Network Common Interface Unit | - | Organizations |
| NCR | No Calibration Required | - | Organizations |
| NCR | Nonconformance/Failure Report | - | Organizations |
| NCS | Nutation Control System | - | Organizations |
| ND | NASA Document | - | Organizations |
| ND | Neodymium | - | Organizations |
| NDE | Nondestructive Evaluation | - | Organizations |
| NDI | Nondestructive Inspection | - | Organizations |
| NDT | Nondestructive Test | - | Organizations |
| NDTF | Nondestructive Test Facility | - | Organizations |
| NDTL | Nondestructive Test Laboratory | - | Organizations |
| NEA | Noise Equivalent Angle | - | Organizations |
| NEC | National Electrical Code | - | Organizations |
| NEG | Negative | - | Organizations |
| NEP | NNEP Normal Entry Point | - | Organizations |
| NEP | Nominal Entry Point | - | Organizations |
| NESC | NNESCNational Electrical Safety Code | - | Organizations |
| NESR | NNESRNatural Environment Support Room | - | Organizations |
| NET | NNET Network (N/W Preferred) | - | Organizations |
| NET | PositivNet Positive Suction Pressure | - | Organizations |
| NETCOM | NNETCOMNetwork Communications | - | Organizations |
| NETWORK | IntNetwork Interface Processor | - | Organizations |
| NETWORK | ProNetwork Program | - | Organizations |
| NF | NNF Natural Flood | - | Organizations |
| NFCS | NNFCSNuclear Forces Communications Satellite | - | Organizations |
| NFPA | NNFPANational Fire Protection Association | - | Organizations |
| NFS | NNFS Nozzle Flow Sensor | - | Organizations |
| NFSP | NNFSPNonflight Switch Panel | - | Organizations |
| NFW | NNFW Nonfuel Wasting | - | Organizations |
| NG | NNG Narrow Gage | - | Organizations |
| NGM | NNGM Nitrogen Generation Module | - | Organizations |
| NGT | NASA Ground Terminal | - | Organizations |
| NH | NNH Nominal Heig4t (Adjust Maneuver) | - | Organizations |
