| Acronym | Meaning |
 | NRI | NonreCurring Investment |
| NRL | Naval Research Laboratory |
| NRM | Nonrecurring Maintenance |
| NRP | Normal Rated Power |
| NRS | Nonconformance Reporting System |
| NRT | Near Real-Time |
| NRTS | Not Repairable At This Station |
| NRZ | Non-Return-to-Zero |
| NRZ-L | Non-Return-to-Zero Level |
| NS | Nickel Steel |
| NSA | National Standards Association |
| NSD | NASA Standard Detonator |
| NSGT | NASA Ground Terminal |
| NSI-I | NASA Standard Initiator-Type I (was SMSI) |
| NSN | National Stock Number |
| NSO | NASA Support Operation |
| NSP | NASA SupportPlan |
| NSP | Network Signal Processor |
| NSP | Network Signal Processor |
| NSR | National Slow Rate |
| NSR | Nominal SlowRate |
| NSR | Normal Slow Rate (Maneuver) |
| NSR1 | First Coell;ptic Maneuver |
| NSR2 | Second Coelliptic Maneuver |
| NSS | Nitrogen Supply Subsystem |
| NSSDC | National Space Science Data Center |
| NSTL | National Space Technology Laboratories |
| NSTL | National Space Technology Laboratory (was MTF) |
| NSW | NSP Status Word |
| NT | Newton |
| NTIS | National Technical Information Service |
| NTO | NitrogenTetroxide |
| NTP | Network Test Panel |
| NTP | Normal Temperature And Pressure |
| NTP | Notice ToProceed |
| NTS | Near Term Schedule |
| NTS | Not To Scale |
| NTSO | NASA Test Support Office |
| NTTF | Network Test And Training Facility |
| NUCLEAR | ShuNuclear Shuttle |
| NUL | Non-GSE Utilization List |
| NVAFB | North Vandenberg Air Force Base |
| NVB | Navigational Base |
| NVPOWG | NASA/VAFB Payload Operations Working Group |
| NVR | No Voltage Release |
| NVR | Non-Verification Required |
| NVR | Nonvolatile Residue |
| NW | NASA Waiver |
| NW | Nose Wheel |
| NWS | National Weather Service |
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