| 項目 |
| N |
| n |
| n |
| NA［Republic of Namibia］ |
| Na［(ド) Natrium］ |
| NAA［National Association of Accountants］ |
| NAACP［National Association for the Advancement of Colored People］ |
| NAB1［National Association of Commercial Broadcasters in Japan］ |
| NAB2［New Arrangements to Borrow］ |
| NACC［North Atlantic Co-operation Council］ |
| NACCS（ナックス）［Nippon Automated Custom Clearance System］ |
| NACS［Nippon Association of Consumer Specialists］ |
| NAD［nicotinamide adenine dinucleotide］ |
| NAFTA（ナフタ）［North American Free Trade Agreement］ |
| NAL［National Aerospace Laboratory］ |
| NAM1［National Association of Manufacturers］ |
| NAM2［Republic of Namibia］ |
| NAMMCO（ナムコ）［North Atlantic Marine Mammal Commission］ |
| NAN［Nandi］ |
| NANA（ナナ）［North American Newspaper Alliance］ |
| NAOC（ナオック）［Nagano Olympic Organizing Committee］ |
| NAPF（ナップ）［(エスペラント) Nippona Artista Proleta Federacio］ |
| NARC［Newspaper Advertising Review Council］ |
| NASA（ナサ）［National Aeronautics and Space Administration］ |
| NASCAR（ナスカー）［National Association for Stock Car Auto Racing］ |
| NASD［National Association of Securities Dealers］ |
| NASDA（ナスダ）［National Space Development Agency of Japan］ |
| NASDAQ（ナスダック）［National Association of Securities Dealers Automated Quotations］ |
| NAT［network address translator］ |
| NATO（ナトー）［North Atlantic Treaty Organization］ |
| NAVSTAR（ナブスター）［Navigation System with Time and Ranging］ |
| NB［national brand］ |
| Nb［(ド) Niob］ |
| NBA1［National Basketball Association］ |
| NBA2［National Braille Association］ |
| NBC［National Broadcasting Company］ |
| NBC 兵器［nuclear, biological and chemical weapons］ |
| NBR［acrylonitrile-butadiene rubber］ |
| NC1［network computer］ |
| NC2［New Caledonia］ |
| NC3［Nordic Council］ |
| NC4［numerical control］ |
| n/c［no change］ |
| NCA［Republic of Nicaragua］ |
| NCAA［National Collegiate Athletic Association］ |
| NCC1［National Christian Council of Japan］ |
| NCC2［New Common Carrier］ |
| NCD［negotiable certificate of deposit］ |
| NCNA［New China News Agency］ |
| NCU1［network control unit］ |
| NCU2［neurological care unit］ |
| Nd［(ド) Neodym］ |
| NDC［Nippon Decimal Classification］ |
| NDL［National Diet Library Classification］ |
| NDP［net domestic product］ |
| NDT1［Nichigeki Dancing Team］ |
| NDT2［nondestructive testing］ |
| NE［Republic of Niger］ |
| Ne［neon］ |
| NEC［National Economic Council］ |
| NED1［A New English Dictionary on Historical Principles］ |
| NED2［Kingdom of the Netherlands］ |
| NEDO（ネド）［New Energy and Industrial Technology Development Organization］ |
| NEEDS（ニーズ）［Nikkei Economic Electronic Databank System］ |
| NELSON（ネルソン）［New Editing and Layout System of Newspapers］ |
| NEO1［near-earth object］ |
| NEO2［noncombatants evacuation operations］ |
| NEP1［Kingdom of Nepal］ |
| NEP2（ネップ）［(ロ) Novaya ekonomicheskaya politika］ |
| NF1［National Front］ |
| NF2［nonfiction］ |
| NF3［Norfolk Islands］ |
| NF4［(フ) Norme francaise］ |
| N.F.［National Front］ |
| NFC［National Football Conference］ |
| NFL［National Football League］ |
| NFS［network file system］ |
| NFUA［National Federation of UNESCO Associations in Japan］ |
| NG1［Federal Republic of Nigeria］ |
| NG2［National Gallery of Art］ |
| NG3［National Guard］ |
| NG4［no good］ |
| N.G.［National Gallery］ |
| NGC 星表［New General Catalogue of Nebulae and Clusters of Stars］ |
| NGF［nerve growth factor］ |
| NGL［natural gas liquid］ |
| NGO1［Nagoya］ |
| NGO2［nongovernmental organization］ |
| NGR［Federal Republic of Nigeria］ |
| NGS［Nagasaki］ |
| NH［All Nippon Airways］ |
| NHK［Nippon Hoso Kyokai］ |
| NHL［National Hockey League］ |
| N.H.S.［national health service］ |
| NI1［national income］ |
| NI2［Republic of Nicaragua］ |
| Ni［nickel］ |
| NIC［network interface card］ |
| NICE［National Institute on Consumer Education］ |
| NICU［neonatal intensive care unit］ |
| NIEO（ニエオ）［New International Economic Order］ |
| NIES（ニーズ）［newly industrializing economies］ |
| NIG［Republic of Niger］ |
| NIH［National Institutes of Health］ |
| NII［National Information Infrastructure］ |
| NIMBY（ニンビー）［not in my back yard］ |
| NIRA（ニラ）［National Institute for Research Advancement］ |
| NIS［Newly Independent States］ |
| NIST（ニスト）［National Institute of Standards and Technology］ |
| NISTEP［National Institute of Science and Technology Policy］ |
| NK［Nippon Kaiji Kyokai］ |
| NK 細胞［natural killer cell］ |
| NL1［Kingdom of the Netherlands］ |
| NL2［National League］ |
| NLA［neuroleptanalgesia］ |
| NLD［National League for Democracy］ |
| NLM［National Library of Medicine］ |
| NLP［night landing practice］ |
| nm［nautical mile］ |
| NMD［National Missile Defense］ |
| NMF［natural moisturizing factor］ |
| NMR［nuclear magnetic resonance］ |
| NMR-CT［nuclear magnetic resonance computed tomography］ |
| NNE［net national expenditure］ |
| NNP［net national product］ |
| NNW［net national welfare］ |
| NO［Kingdom of Norway］ |
| No［nobelium］ |
| No., no.［(ラ) numero］ |
| no.［(フ) nombre］ |
| NOAA（ノア）［National Oceanic and Atmospheric Administration］ |
| NOC［National Olympic Committee］ |
| NoHo（ノーホー）［North of Houston Street］ |
| NOR［Kingdom of Norway］ |
| NORAD（ノーラッド）［North American Aerospace Defense Command］ |
| NOT 回路［NOT circuit］ |
| NOTAM, notam（ノータム）［notice to airmen］ |
| NOU［Noumea］ |
| NOW（ナウ）［National Organization for Women］ |
| NOW 勘定［negotiable order of withdrawal］ |
| NOx（ノックス）［nitrogen oxides］ |
| NP［Kingdom of Nepal］ |
| Np［neptunium］ |
| NPA［New People's Army］ |
| NPC［National People's Congress］ |
| NPD［(ド) Nationaldemokratische Partei Deutschlands］ |
| NPO［nonprofit organization］ |
| NPS［nuclear power station］ |
| NPSC［National Public Safety Commission］ |
| NPT［Nuclear Nonproliferation Treaty］ |
| NR1［noise reduction］ |
| NR2［Republic of Nauru］ |
| NR 数［noise rating number］ |
| NRA［National Rifle Association of America］ |
| NRC［Nuclear Regulatory Commission］ |
| N.R.F.［(フ) La Nouvelle Revue Francaise］ |
| NRI［Nomura Research Institute］ |
| NRT［Narita］ |
| NRU［Republic of Nauru］ |
| NS クラス［Nippon Standard Class］ |
| NSA1［National Security Agency］ |
| NSA2［National Standards Association］ |
| NSC1［National Security Council］ |
| NSC2［National Space Council］ |
| NSC3［neighborhood shopping center］ |
| NSC4［Nuclear Safety Commission］ |
| NSF［National Science Foundation］ |
| NSFNET［National Science Foundation Network］ |
| NSI［new social indicators］ |
| NSK［Nihon Shinbun Kyokai］ |
| NST［non-stress test］ |
| NT［National Trust］ |
| N.T.［New Testament］ |
| NTB1［non-tariff barrier］ |
| NTB2［(ノルウエー) Norsk Telegrambyra］ |
| NTF［Nigeria Trust Fund］ |
| NTFA［National Track and Field Association］ |
| NTM［non-tariff measures］ |
| NTSB［National Transportation Safety Board］ |
| NTSC［National Television System Committee］ |
| NTSC 方式［NTSC color television system］ |
| NTT［Nippon Telegraph and Telephone Corporation］ |
| NU［Niue］ |
| NUCEF［Nuclear Fuel Cycle Safety Engineering Research Facility］ |
| NUL［National Urban League］ |
| NUP［National Unity Party］ |
| NVC［nonverbal communication］ |
| NVOCC［non-vessel operating common carrier］ |
| NW［Northwest Airlines］ |
| N.Y., N.Y.C.［New York City］ |
| NYMEX（ナイメックス）［New York Mercantile Exchange］ |
| NYSE［New York Stock Exchange］ |
| NYT［New York Times］ |
| NZ1［Air New Zealand］ |
| NZ2［New Zealand］ |
| NZL［New Zealand］ |