| Acronym | Meaning |
 | NMCS | Not Mission Capable Supply (SM&R Code) |
| NMD | U.S. National Missile Defense |
| NMN | No Middle Name |
| NMOS | N-type/Negative Metal-Oxide-Semiconductor Transistor (enn-moss) |
| NMR | Nuclear Magnetic Resonance |
| NMSG | NATO Modelling And Simulation Group |
| NN | Nanonewton |
| NN | Norwegian Nynorsk Language (ISO 639-1 Code) |
| NNE | North North-East |
| NNO | Norwegian Nynorsk Language (ISO 639-2 Code) |
| NNSA | U.S. National Nuclear Security Administration |
| NNW | North North-West |
| NO | FEAR -Notification And Federal Employee Antidiscrimination Retaliation Act (2002) |
| NO | Nitric Oxide -Normally Open -Norway (ISO 3166 And FIPS 10-4 Country Code Digram) |
| NO | Nobelium |
| NO | Norwegian Language (ISO 639-1 Code) |
| NOAA | U.S. National Oceanic And Atmospheric Administration |
| NOAF | Norwegian Air Force |
| NOAO | National Optical Astronomy Observatory |
| NOB | Norwegian Bokm?l Language (ISO 639-2 Code) |
| NOC | UK. National Oceanography Centre |
| NODEF | NATO Oceanographic Data Exchange Format |
| NOK | Norwegian Krone (ISO 4217 Currency Code) |
| NOLF | Navy OutLying Field |
| NOM | Novus Ordo Missae Or New Ordinary Of The Mass (sometimes Abbreviated To Simply NO) |
| NOMBO | Non-mine |
| NOPA | National Office Products Alliance - National Office Products Association |
| NOR | Norway (ISO 3166 Trigram) |
| NOR | Norwegian Language (ISO 639-2 Code) |
| NORAD | North American Aerospace Defense Command |
| NORML | National Organization For The Reform Of Marijuana Laws (normal) |
| NORTHAG | Northern Army Group |
| NORWICH | (k)Nickers Off Ready When I Come Home (British Army Slang Written On Letters Home) |
| NOS | Network Operating System - New Old Stock (Internet Auction/trading Listings) - Nitric Oxide Synthase (enzyme) |
| NOSA | NATO OSI Security Architecture |
| NOTAFLOF | No One Turned Away For Lack Of Funds |
| NOTAM | Notice To Airmen |
| NOW | National Organization For Women |
| NP | Neap Tide (nautical Charts) -Neptunium |
| NP | National Permit - A Permit In India For Trucks So They Can Go Anywhere In The Nation. |
| NP | Nepal (ISO 3166 And FIPS 10-4 Country Code Digram) |
| NPC | National Postgraduate Committee - National Provincial Championship (New Zealand Rugby Competition) - Navigation Planning Chart - Non-Player Character (role-playing Games) |
| NPD | Nationaldemokratische Partei Deutschlands (German) |
| NPDI | New Product Development And Introduction |
| NPG | Needline/Network Participation Group |
| NPH | Normal Pressure Hydrocephalus |
| NPL | National Priorities List -Nepal (ISO 3166 Trigram) |
| NPOV | Neutral Point Of View |
| NPR | National Public Radio -Nepalese Rupee (ISO 4217 Currency Code) |
| NQ | Dronning Maud Land (ISO 3166 Digram; Obsolete 1983) |
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