| Acronym | Meaning |
| NPPSBO | Navy Publishing And Printing Service Branch Office |
| NPPSO | Naval Publications Printing Support Office |
| NPR | Naval Plant Representative |
| NPR | Power Turbine Speed Right |
| NR | Proprotor Speed (rpm) |
| NR | Submersible Research Vehicle (misc) |
| NRAC | Nato Requirements & Criteria |
| NRL | Navy Research Laboratories |
| NRMC | Navy Regional Medical Center |
| NROTC | Naval Reserve Officer Training Corps |
| NRP | Navigation Reference Point |
| NRR | Navy Research Requirements |
| NRZ | Non-return-to-zero |
| NSA | National Security Agency |
| NSCCA | Nuclear Safety Cross-check Analysis |
| NSD | Navy Support Data |
| NSN | National Stock Number |
| NSO | Network Security Officer |
| NSP | Navy Support Plan |
| NTC | Naval Training Center |
| NTDS | Navy Tactical Data System |
| NTDS | Navy Technical Data System |
| NTDS | Navy Tactical Data Systems (lab) (20f17) |
| NTHG | Nothing |
| NTIPP | Navy Technical Information Presentation Program |
| NTIS | National Technical Information Service |
| NTP | Navy Training Plan |
| NTPC | Navy Training Plan Conference |
| NTS | Naval Training Station |
| NTSC | Naval Training Systems Center |
| NTTC | Naval Technical Training Center (corry Field) |
| NU | Nose Up |
| NUD | Non-update |
| NUO | North Up |
| NUSC | Naval Underwater Systems Center |
| NUSRL | Naval Underwater Sound Ref Lab |
| NUWC | Naval Underwater Warfare Center (formerly Triccsma) |
| NVG | Night Vision Goggles |
| NVIS | Near Vertical Incident Skywave |
| NVM | Non-volatile Memory |
| NVMS | Noise And Vibration Monitoring System |
| NWC | Naval Weapons Center (china Lake) |
| NWS | Nose Wheel Steering |
| NWSA | Nose Wheel Steering Actuator |
| O&M | Operations And Maintenance |
| O&MN | Operations And Maintenance, Navy |
| O&S | Operating And Support |
| O&SHA | Operating And Support Hazard Analysis |
| O/I | Outboard/inboard |
| O/O | Outboard/outboard |