| 1 | NM | The Mount Cook Group Ltd. | ICAO: NZM, Callsign: Mountcook, IATA Prefix: 445, Name changed to The Mount Cook Airline Ltd. | NZ | AVCODES |
| 2 | NM | Mount Cook Airlines | Callsign: Mount cook, IATA Prefix: 445, | NZ | AVCODES |
| 3 | NM | Air Madrid Lineas Aereas, S.A. | ICAO: DRI, Callsign: Alada Air, IATA Prefix: 476, ICAO designator changed to DRD | E | AVCODES |
| 4 | NM | Air Madrid Lineas Aereas, S.A. | ICAO: DRD, Callsign: Alada Air, IATA Prefix: 476, Ceased operations on 15 December 2006. ICAO designator changed from DRI | E | AVCODES |
| 5 | NM | The Mount Cook Airline Ltd. | ICAO: NZM, Callsign: Mountcook, IATA Prefix: 445, Name changed from The Mount Cook Group Ltd. | NZ | AVCODES |
| 6 | NM | SAS Natireva t/a Air Moana | ICAO: NTR, | PF | AVCODES |
| 7 | NMA | Billmans Management Ltd t/a Ansett New Zealand | IATA: NY, Callsign: Anza, | NZ | AVCODES |
| 8 | NMA | Newmans Airways Limited | IATA: NY, Callsign: Newmans, | NZ | AVCODES |
| 9 | NMA | Nesma Airlines Company Ltd. | IATA: NA, Callsign: Nesma, Commenced operations on on 18 July 2010. | ET | AVCODES |
| 10 | NMAC | NEWMAN AND CREBBIN | | | SCAC3 |
| 11 | NMAC | NEDA MARITIME AGENCY CO LTD | | | SCAC4 |
| 12 | NMAG | NORKO MARINE AGENCY | | | SCAC3 |
| 13 | NMAG | NORKO MARINE AGENCY INC | | | SCAC4 |
| 14 | NMAI | NORDEN, M A CO INC | | | SCAC3 |
| 15 | NMAI | NOR-MAR INDUSTRIES LTD | | | SCAC4 |
| 16 | NMAS | NORTHERN MOVING & STORAGE | | | SCAC3 |
| 17 | NMAS | NORTHLAND STEEL & TRIM LLC | | | SCAC4 |
| 18 | NMAU | COMMANDER, NAVAL AIR SYSTEMS COMMAND AIR 6.7.6.2 | | USA | BIC |
| 19 | NMAU | NAVAL AIR SYSTEMS | | | SCAC4 |
| 20 | NMB | Air Namibia | IATA: SW, Callsign: Namibia, IATA Prefix: 186, Ceased operation on 11 February 2021. | NAM | AVCODES |
| 21 | NMB | Air Namibia | IATA: SW | | ICAO1 |
| 22 | NMBG | NAVIGATION MARITIME BULGARE | | | SCAC4 |
| 23 | NMBS | Nationale Maatschappij van Belgische Spoorwegen | | BE | VKM |
| 24 | NMCA | NORTHLAND MAINTENANCE COMPANY | | | SCAC4 |
| 25 | NMCC | NISSAN MOTOR CAR CARRIER CO LTD | | | SCAC3 |
| 26 | NMCC | NISSAN MOTOR CAR CARRIER CO | | | SCAC4 |
| 27 | NMCG | NMC LOGISITICS INTERNATIONAL INC | | | SCAC4 |
| 28 | NMCH | NATIONAL MOTOR COACH | | | SCAC3 |
| 29 | NMCH | NATIONAL TRANSPORTATION COMPANY INC | | | SCAC4 |
| 30 | NMCL | NMC LOGISTICS INTERNATIONAL CO LTD | | | SCAC4 |
| 31 | NMCO | NEW MARINE CONSOLIDATION CO LTD | | | SCAC4 |
| 32 | NMCW | NIEVES MARITIME CORP | | | SCAC4 |
| 33 | NMCX | National Machinery Co. | added 4/1976; 1/1980-1/1994; eliminated 10/1998; 7/2000 (not listed) | | NAKINA |
| 34 | NMCX | Merchants Despatch Transportation Corp. | added 7/1962; 7/1965-10/1966; eliminated 4/1967; 4/1970 | | NAKINA |
| 35 | NMCX | Northern Refrigerator Line, Inc. | added 10/1955; 10/1957-4/1961; eliminated 7/1962 | | NAKINA |
| 36 | NMCX | Northern Refrigerator Line, Inc. | 10/57-4/61 | | NRHS |
| 37 | NMCX | Merchants Despatch Transportation Corp. | 7/65-10/66; eliminated 4/67; 4/70 | | NRHS |
| 38 | NMCX | National Machinery Co. | added 4/76; 1/80-1/94; eliminated 10/98; 7/2000 | | NRHS |
| 39 | NMCX | NATIONAL MACHINERY COMPANY (MERCHANTS DESPATCH TRANSPORTATION CORP.[NORTHERN REFRIGERATOR LINE INC.]) | | | PWRC |
| 40 | NMCX | National Machinery | | | RSRV |
| 41 | NMCZ | NORTHSHORE MINING CO. | | | PWRC |
| 42 | NMD | Nomad Aviation (Pty) Ltd t/a Bay Air Aviation | IATA: N6, Callsign: Nomad Air, Operates flights obo flyafrica.com | NAM | AVCODES |
| 43 | NMD | Nomad Aviation | | | ICAO1 |
| 44 | NMDE | NOMADE TRANSPORT | | | SCAC4 |
| 45 | NMDG | NORTH MISSISSIPPI DEVELOPMENT GROUP | | | SCAC4 |
| 46 | NMDI | NATURESMATE DISTRIBUTION INC | | | SCAC4 |
| 47 | NMDO | NEW MEXICO DISTRIBUTING | | | SCAC4 |
| 48 | NMDS | NATIONAL MAIL DELIVERY SERVICE | | | SCAC3 |
| 49 | NME | Neuköln - Mittenwalder Eisenbahn-Gesellschaft AG | Berlin | D | privat-bahn.de |
| 50 | NME | Neukölln-Mittenwalder Eisenbahn-Gesellschaft AG | | D | TRAFFIC |
| 51 | NME | Neukölln-Mittenwalder Eisenbahn-Gesellschaft | | DE | VKM |
| 52 | NMEA | NEMEA E N E | | | SCAC3 |
| 53 | NMEC | NUCHOICE MEDICAL | | | SCAC4 |
| 54 | NMEI | NEWMARKE | | | SCAC4 |
| 55 | NMEL | NOR-AM ENTERPRISES LTD | | | SCAC4 |
| 56 | NMEN | N MENU INT'L | | | SCAC4 |
| 57 | NMEQ | NILSON MOTOR EXPRESS | | | SCAC3 |
| 58 | NMES | NOW MESSENGER SERVICE INC | | | SCAC3 |
| 59 | NMET | NORTHERN MAINE TRANSPORT INC | | | SCAC3 |
| 60 | NMEXT | New Mexico Transportation | A Grayhound Subsidiary | USA | TRAFFIC |
| 61 | NMFH | NATIONAL MOTOR FREIGHT LLC | | | SCAC4 |
| 62 | NMFL | NORTHEASTERN MONTANA FREIGHT LINE | | | SCAC3 |
| 63 | NMFN | NIAGARA MOTOR FREIGHT INC | | | SCAC4 |
| 64 | NMFU | NATIONAL OCEANOGRAPHY CENTRE | | GB | BIC |
| 65 | NMFU | NATIONAL OCEANOGRAPHY CENTRE | | | SCAC4 |
| 66 | NMG | Genghis Khan Airlines Co., Ltd. | IATA: 9D, Callsign: Tianjiao Air, IATA Prefix: 568, Formerly Tianjiao Airlines. | PRC | AVCODES |
| 67 | NMGD | NORTHLAND MONUMENT GRANITE DESIGNS | | | SCAC4 |
| 68 | NMGH | NEWNES-MCGE | | | SCAC4 |
| 69 | NMGR | New Mexico Gateway R.R. LLC | 7/2005 | | NAKINA |
| 70 | NMGR | NEW MEXICO GATEWAY RAILROAD | | | PWRC |
| 71 | NMGR | New Mexico Gateway Railroad | | | RSRV |
| 72 | NMGR | NEW MEXICO GATEWAY RAILROAD LLC | | | SCAC4 |
| 73 | NMGS | NORTHLAKE MOVING & STORAGE INC | | | SCAC3 |
| 74 | NMHD | NEWTONS MOBILE HOME DELIVERY & SERV | | | SCAC3 |
| 75 | NMHE | NEAL MACHINERY ERECTORS INC | | | SCAC3 |
| 76 | NMHO | NEUMAN, EUGENE HOMER | | | SCAC4 |
| 77 | NMHS | NORWALK MOBILE HOME SERVICE | | | SCAC3 |
| 78 | NMHT | NORMANS MOBILE HOME TRANSPORT | | | SCAC3 |
| 79 | NMHU | MASSY GAS PRODUCTS (TRINIDAD) LTD | | TT | BIC |
| 80 | NMHU | INDUSTRIAL GASES LIMITED | | | SCAC4 |
| 81 | NMI | Pacific Wings | IATA: LW, Callsign: Tsunami, IATA Prefix: 568, Change of name from Air Nevada Airlines Inc. d/b/a Pacific Wings. ICAO designator changed from ANV | USA | AVCODES |
| 82 | NMI | Pacific Wings | IATA: LW | | ICAO1 |
| 83 | NMIA | NINEMIA SHIPPING LTD. | | | SCAC3 |
| 84 | NMID | NIEMI, DOUG TRUCKING | | | SCAC4 |
| 85 | NMIK | NORTHERN MANAGEMENT INC | | | SCAC4 |
| 86 | NMIM | NEW MEXICO INSTITUTE OF MINING AND | | | SCAC3 |
| 87 | NMIN | NOBLERA MOTORS INC | | | SCAC4 |
| 88 | NMIQ | NEMCO MOTORSPORTS INC | | | SCAC4 |
| 89 | NMIR | NORTHERN MARINE INC | | | SCAC4 |
| 90 | NMIS | NOESAM INC | | | SCAC4 |
| 91 | NMIX | NSC Minerals Inc. | 7/2005 (not listed) | | NAKINA |
| 92 | NMIX | NSC MINERALS, INC. | | | PWRC |
| 93 | NMIX | NSC MINERALS INC | | | SCAC4 |
| 94 | NMJA | NAVARRO MIRELES, JORGE ARTURO | | | SCAC4 |
| 95 | NMJD | NEW MILLENNIUM JOIST & DECK DE MEXI | | | SCAC4 |
| 96 | NMJR | NEVAREZ MORENO, JOSE RAMON | | | SCAC4 |
| 97 | NMKE | NEVLAND, MIKE & SONS | | | SCAC4 |
| 98 | NMKU | PJSC MINING AND METALLURGICAL COMPANY NORILSK NICKEL | | RUS | BIC |
| 99 | NMKU | JSC MMC NORILSK NICKEL | | | SCAC4 |
| 100 | NMKX | Newark Milk & Cream Co. | 7/1935-1/1946 | | NAKINA |
