| Acronym | Meaning |
 | NATF | Naval Air Test Facility |
| NATL | National |
| NAV | Navigate |
| NAVAID | Navigation Aid |
| NAVDAD | Navigationally Derived Air Data |
| NAVPOOL | Navigation Parameter Common Pool |
| NAVSAT | Navigation Satellite |
| NB | Narrow Band |
| NB | Navigation Base |
| NB | Niobium |
| NB | Nitrogen Base |
| NB | No-Bias (Relay) |
| NBF | Neutral Buoyancy Facility |
| NBS | National Bureau Of Standards |
| NBT | Neutral Buoyancy Trainer |
| NC | National Course |
| NC | No Comment |
| NC | No Change |
| NC | Noise Criteria |
| NC | Normally Closed |
| NC | Normally Closed |
| NC | Numerical Control |
| NC1 | Nominal Correction 1 (Phasing Maneuver) |
| NCC | NASA Class Code |
| NCC | Network Control Center (GSFC) |
| NCC | Nominal Corrective Combination (Maneuver) |
| NCGS | Nuclear Criteria Group Secretary |
| NCI | Phasing Maneuver |
| NCIU | Network Common Interface Unit |
| NCR | No Calibration Required |
| NCR | Nonconformance/Failure Report |
| NCS | Nutation Control System |
| ND | NASA Document |
| ND | Neodymium |
| NDE | Nondestructive Evaluation |
| NDI | Nondestructive Inspection |
| NDT | Nondestructive Test |
| NDTF | Nondestructive Test Facility |
| NDTL | Nondestructive Test Laboratory |
| NEA | Noise Equivalent Angle |
| NEC | National Electrical Code |
| NEG | Negative |
| NEP | NNEP Normal Entry Point |
| NEP | Nominal Entry Point |
| NESC | NNESCNational Electrical Safety Code |
| NESR | NNESRNatural Environment Support Room |
| NET | NNET Network (N/W Preferred) |
| NET | PositivNet Positive Suction Pressure |
| NETCOM | NNETCOMNetwork Communications |
| NETWORK | IntNetwork Interface Processor |
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