| Acronym | Meaning |
 | NAAD | North American Air Defense |
| NAAFI | Navy |
| NAAK | Mark I NAAK |
| NAAQS | National Ambient Air Quality Standards |
| NAAWS | NATO Anti-Air Warfare System |
| NABCI | North American Bird Conservation Initiative (nab-see) |
| NAC | National Agency Check - U.S. Naval Avionics Center - U.S. Navy Advanced Concepts - North Atlantic Council - Northern Area Command |
| NACA | (U.S.) National Advisory Committee For Aeronautics (1915?1958 |
| NACC | North Atlantic Cooperation Council |
| NACISA | NATO Communications And Information Systems Agency |
| NACMA | NATO Air Command And Control System Management Agency |
| NAD | Namibian Dollar (ISO 4217 Currency Code) |
| NAEC | U.S. Naval Air Engineering Center |
| NAF | NATO Architecture Framework -Naval Air Facility |
| NAFLD | NonAlcoholic Fatty Liver Disease |
| NAFO | Northwest Atlantic Fisheries Organization |
| NAFTA | North American Free Trade Agreement |
| NAGPRA | Native American Graves Protection And Repatriation Act |
| NAI | Named Area Of Interest -Network Access Identifier |
| NAICS | North American Industry Classification System |
| NAILS | National Airspace Integrated Logistics System |
| NAIRU | Non Accelerating Inflation Rate Of Unemployment |
| NAK | Negative Acknowledge |
| NAM | Namibia (ISO 3166 Trigram) |
| NAMBLA | North American Man-Boy Love Association |
| NAMRL | Naval Aerospace Medical Research Laboratory |
| NAN | Not A Number (computing) |
| NAO | UK National Audit Office |
| NAPDD | Non-Acquisition Program Definition Document (nap-dee-dee) |
| NAPS | Navy Acquisition Procedures Supplement |
| NARA | (U.S.) National Archives And Records Administration |
| NARAL | National Abortion Rights Action League |
| NARDAC | Naval Regional Data Automation Center |
| NARDIC | U.S. Navy Acquisition Research And Development Information Center |
| NARPV | National Association For Remotely Piloted Vehicles |
| NAS | National Academy Of Sciences - National Air Space - National Audubon Society - Naval Air Station - New Attack Submarine |
| NASA | National Aeronautics And Space Administration |
| NASCAR | National Association For Stock Car Auto Racing |
| NASDAQ | National Association Of Securities Dealers Automated Quotations (an American Stock Exchange). |
| NASED | National Association Of State Election Directors [1][2] |
| NASH | Non-Alcoholic SteatoHepatitis |
| NASP | National Aerospace Plane |
| NASS | National Association Of Secretaries Of State [3] |
| NATO | National Association Of Theatre Owners - North Atlantic Treaty Organisation |
| NAU | Nauruan Language (ISO 639-2 Code) |
| NAV | Navigation[al] |
| NAV | Navajo Language (ISO 639-2 Code) |
| NAVCAMS | Naval Communications Area Master Station |
| NAVCC | National Audio-Visual Conservation Center |
| NAVCC (NAVY) | Navy Component Commander |
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