NA
- na – (s) Nauruan language (ISO 639-1 code)
- nA – (s) Nanoampere
- Na – (s) Sodium (Latin Natrium)
- NA – (s) Namibia (ISO 3166 digram) – (i) Narcotics Anonymous – (i) National Archives – Negative Acknowledge
- N/A – (i) Neurotics Anonymous – (i) not available/applicable
- NAA – (p) N-Acetylaspartate
- NAAD – (i) North American Air Defense
- NAAFI – (a) Navy, Army and Air Force Institute (UK) – (a) No Ambition And Fuckall Interest (RSA army slang)
- NAAK – (a) Mark I NAAK, Nerve Agent Antidote Kit
- NAACP – (i) National Association for the Advancement of Colored People ("N double-A CP")
- NAAQS – (a) National Ambient Air Quality Standards
- NAAWS – (i) NATO Anti-Air Warfare System
- NABCI – (a) North American Bird Conservation Initiative ("nab-see")
- NAC – (i/a) National Agency Check – U.S. Naval Avionics Center – U.S. Navy Advanced Concepts – North Atlantic Council – Northern Area Command
- NACA – (i) (U.S.) National Advisory Committee for Aeronautics (1915–1958, became NASA)
- NACC – (i) North Atlantic Cooperation Council
- NACISA – (a) NATO Communications and Information Systems Agency
- NACMA – (p) NATO Air Command and Control System Management Agency
- NACRA – (a) North America Caribbean Rugby Association (more specifically rugby union)
- NAD – (s) Namibian dollar (ISO 4217 currency code)
- NAEC – (i) U.S. Naval Air Engineering Center
- NAF – (a) NATO Architecture Framework – (i) Naval Air Facility
- NAFLD – (i) NonAlcoholic Fatty Liver Disease
- NAFO – (a) Northwest Atlantic Fisheries Organization
- NAFERA – (a) Native American Free Exercise of Religion Act
- NAFTA – (a) North American Free Trade Agreement
- NAGPRA – (a) Native American Graves Protection and Repatriation Act
- NAI – (i) Named Area of Interest – (i) Network Access Identifier
- NAICS – (a) North American Industry Classification System
- NAIL – (i) Neurotics Anonymous
- NAILS – (a) National Airspace Integrated Logistics System
- NAIRU – (a) Non Accelerating Inflation Rate of Unemployment
- NAK – (p) Negative Acknowledge
- NAM – (s) Namibia (ISO 3166 trigram)
- NAMBLA – (a) North American Man-Boy Love Association
- NAMRL – (i) Naval Aerospace Medical Research Laboratory
- NaN – (i) Not A Number (computing)
- NAO – (i) UK National Audit Office
- NAPDD – (i) Non-Acquisition Program Definition Document ("nap-dee-dee")
- NAPS – (a) Navy Acquisition Procedures Supplement
- NARA – (i) (U.S.) National Archives and Records Administration
- NARAL – (a) National Abortion Rights Action League
- NARDAC – (a) Naval Regional Data Automation Center
- NARDIC – (a) U.S. Navy Acquisition Research and Development Information Center
- NARPV – (i) National Association for Remotely Piloted Vehicles
- NAS – (i) National Academy of Sciences – National Air Space – National Audubon Society – Naval Air Station – New Attack Submarine
- NASA – (a) National Aeronautics and Space Administration
- NASCAR – (a) National Association for Stock Car Auto Racing
- NASDAQ – (a) National Association of Securities Dealers Automated Quotations
- NASED – (a) National Association of State Election Directors
- NASH – (a) Non-Alcoholic Steatohepatitis
- NASP – (p) National Aerospace Plane
- NASS – (a) National Association of Secretaries of State
- NATO – (a) National Association of Theatre Owners – North Atlantic Treaty Organisation
- nau – (s) Nauruan language (ISO 639-2 code)
- NaUKMA – (p) National University of Kyiv-Mohyla Academy
- nav – (s) Navajo language (ISO 639-2 code)
- NAV – (p) Navigation
- NAVCAMS – (p) Naval Communications Area Master Station
- NAVCC – (p) National Audio-Visual Conservation Center
- NAVCC (Navy) – (p) Navy Component Commander
- NAVCENT – (p) Naval Forces U.S. Central Command
- NAVDAC – (p) Naval Data Automation Command
- NAVEUR – (p) Naval Forces U.S. European Command
- NAVFE – (p) U.S. Naval Forces, Far East
- NAVFOR – (p) Naval Force
- NAVMACS – (p) Naval Modular Automatic Communication Subsystem
- NAVNET – (p) Navy Network
- NAVS – (a) Non-Cooperative Airborne Vector Scoring
- NAVSAT – (p) Navigation Satellite
- NAVSPACECOM – (p) U.S. Navy Space Command
- NAVSPASUR – (p) U.S. Naval Space Surveillance System
- NAVSTAR – (p) Navigation Satellite Timing And Ranging
- NAVTACNET – (p) Navy Tactical Network
- NAWC – (i) U.S. Naval Air Warfare Center
- NAWMP – (a) North American Waterfowl Management Plan ("gnaw-wump")
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