Space transport engineering, spaceflight engineering, astronautics, astronautical engineering, cosmonautics, rocketry, spacecraft, rockets and missiles.
| Acronym | Sense | Language | Topics | 
|---|---|---|---|
| MFC | Manual Flight Control | In English | → Aeronautics, aircraft | 
| MFC | Multiple-Flight Computer | In English | → Computer hardware → Aeronautics, aircraft  | 
| MFC | Multiple-Flight Controller | In English | → Aeronautics, aircraft | 
| MFCS | Manual Flight Control System | In English | → Aeronautics, aircraft | 
| MFF | MDM Flight Forward | In English | → Aeronautics, aircraft | 
| MFI | Malmö flygindustri | In Swedish | |
| MFP | Mission Flight Plan | In English | → Aeronautics, aircraft | 
| MFPE | Mission From Planet Earth | In English | → Astronomy | 
| MFR | Maximum Flight Rate | In English | → Aeronautics, aircraft | 
| MFT | Mean Flight Time | In English | → Aeronautics, aircraft | 
| MFTAD | Master Flight Test Assignment Document | In English | → Aeronautics, aircraft | 
| MFTIO | Minimum Flyout Time For Orbital Interception | In English | |
| MG | Middle Gimbal | In English | |
| MGA | Middle Gimbal Angle | In English | |
| MHI | Mitsubishi Heavy Industries | In English | → Mechanical engineering | 
| MICB | Meck Island Control Building | In English | |
| MIDSIM | Midcourse Exoatmospheric Event-Based Simulator | In English | → Astronomy | 
| MILA | Merritt Island Launch Area | In English | |
| MILCOMSAT | Military Communications Satellite | In English | → Military engineering | 
| MILSTAR | Military Strategic And Tactical Relay System | In English | → Military engineering | 
| MIPS | Merritt Island Press Site | In English | → Newspapers, journalism | 
| MIRV | Multiple Independently Targetable Reentry Vehicles | In English | |
| MisSp | Missiles Spacecraft | In English | → Serial publications, periodicals → Military engineering  | 
| MLC | Mobile Launcher Computer | In English | → Computer hardware | 
| MLF | MDM Launch Forward | In English | |
| MLG | Main Landing Gear | In English | → Aeronautics, aircraft | 
| MLGD | Main Landing Gear Door | In English | → Aeronautics, aircraft | 
| MLGS | Microwave Landing Guidance System | In English | → Aeronautics, aircraft | 
| MLP | Mobile Launch Platform | In English | |
| MLP | Mobile Launch(er) Platform | In English | → Aeronautics, aircraft | 
| MLRS | Multiple Launch Rocket System | In English | → Military engineering | 
| MLS | Microwave Landing System | In English | → Aeronautics, aircraft | 
| MLV | Medium Launch Vehicle | In English | → Aeronautics, aircraft | 
| MLV | Medium-Lift Launch Vehicle | In English | → Aeronautics, aircraft | 
| MMLS | Martin Marietta Launch Services | In English | → Aeronautics, aircraft | 
| MMPSE | Multiuse Mission Payload Support Equipment | In English | |
| MMS | Multi-mission Modular Spacecraft | In English | |
| MMS | Manned Maneuvering System | In English | |
| MMS | Mission Modular Spacecraft | In English | |
| MMS | Multimission Modular Spacecraft | In English | |
| MMS | Multimission Spacecraft | In English | |
| MMU | Manned Maneuvering Unit | In English | |
| MO | Manned Orbiter | In English | |
| MOC | Mystérieux Objets Célestes | In French | → Astronomy | 
| MODE | Middeck Zero-Gravity Dynamics Experiment | In English | |
| MODS | Military Orbital Development System | In English | → Military engineering | 
| MOF | Manned Orbital Flight | In English | |
| MOL | Manned Orbital Laboratory | In English | → Research institutes | 
| MORL | Manned Orbiting Research Laboratory | In English | → Research institutes | 
| MOSPO | Mobile Satellite Photometric Observatory | In English | → Observatories | 
| MOSS | Manned Orbital Space Station | In English | |
| MPGHM | Mobile Payload Ground Handling Mechanism | In English | |
| MPI | Mission Payload Integration | In English | |
| MPIO | Mission Payload Integration Office | In English | |
| MPMSE | Multiuse Payload and Mission Support Equipment | In English | |
| MPPSE | Multipurpose Payload Support Equipment | In English | |
| MPS | Material Processing Satellite | In English | → Materials science | 
| MPS | Materials Processing In Space | In English | → Materials science | 
| MPVA | Main Propellant Valve Actuator | In English | |
| MRSR | Mars Rover Sample Return | In English | → Planets and satellites | 
| MS/MS | Material Science and Manufacturing in Space | In English | → Engineering, technology | 
| MSBLS | Microwave Scan-Beam Landing System | In English | → Aeronautics, aircraft | 
| MSBLSGS | Microwave Scan-Beam Landing System Ground Station | In English | |
| MSCTN | Meteorological Satellite Center Technical Note | In English | → Serial publications, periodicals → Meteorology, climatology  | 
| MSDT | Multiple Shuttle Data Tape | In English | → Data | 
| MSE | Manned Space Flight Engineer | In English | |
| MSF | Manned Space Flight | In English | |
| MSFC | Marshall Space Flight Center | In English | |
| MSFN | Manned Space Flight Network | In English | |
| MSFP | Manned Space Flight Program | In English | |
| MSFSG | Manned Space Flight Support Group | In English | |
| MSOB | Manned Spacecraft Operations Building | In English | |
| MSOCC | Multisatellite Operations Control Center | In English | |
| MSS | Medium/Small Satellite Servicing | In English | |
| MSSRV | Mars Surface-Sample Return Vehicle | In English | → Vehicle engineering | 
| MSSTM | Military Space System Technology Model | In English | → Military engineering | 
| MSSTP | Military Space Systems Technology Plan | In English | → Military engineering | 
| MSVP | Master Shuttle Verification Plan | In English | |
| MSX | Midcourse Space Experiment | In English | → Astronomy | 
| MT | Mission Trajectory | In English | |
| MTOGW | Maximum Takeoff Gross Weight | In English | → Aeronautics, aircraft | 
| MTOW | Maximum Takeoff Weight | In English | → Aeronautics, aircraft | 
| MTPE | Mission To Planet Earth | In English | → Planets and satellites | 
| MUA | Maximum Usable Altitude | In English | → Aeronautics, aircraft | 
| MŰI | Magyar Űrkutatási Iroda | In Hungarian | → Astronomy → Hungary  | 
| MUSIS | Multiuser Satellite Imagery System | In English | |
| MVF | Manned Vertical Flight | In English | → Aeronautics, aircraft | 
| MVI | Microgravity Vestibular Investigation | In English | → Astronomy | 
| MVM | Mariner Venus/Mercury | In English | → Astronomy | 
| NAS | National Airspace System | In English | → Aeronautics, aircraft | 
| NASA | National Aeronautics and Space Administration (www.nasa.gov) | In English | → Central administration → Astronomy → Aeronautics, aircraft → United States  | 
| NASAC | NASA Conference Publication | In English | → Serial publications, periodicals → Astronomy → United States  | 
| NASAL | NASA Circular Letter | In English | → Serial publications, periodicals → Astronomy → United States  | 
| NASAR | NASA Reference Publication | In English | → Serial publications, periodicals → Astronomy → United States  | 
| NASAS | NASA Special Publication | In English | → Serial publications, periodicals → Astronomy → United States  | 
| NASCOM | NASA Communications | In English | → Telecommunications → United States  | 
| NASDA | National Space Development Agency | In English | → Central administration → Astronomy  | 
| NASM | National Air and Space Museum (www.nasm.si.edu) | In English | → Museums → Astronomy → Aeronautics, aircraft → United States  | 
| NASO | North American Space Operations | In English | → Astronomy | 
| NASP | National AeroSpace Plane | In English | → Aeronautics, aircraft | 
| NASTRAN | NASA Structural Analysis Program | In English | → Mechanical engineering → United States  | 
| NAVSAT | Navigation Satellite | In English | → Transport and postal services | 
| NAVT | NASA Altimeter Verification Telemetry | In English | → United States | 
| NCC | NASA Class Code | In English | → United States | 
| NCC | NASA Communications Control | In English | → Telecommunications → United States  | 
| NCOS | National Commission On Space | In English | → Astronomy | 
| ND | NASA Document | In English | → Astronomy → United States  | 
| NDGPS | Nationwide Differential Global Positioning System | In English | → Geodesy, cartography → Telecommunications  | 
| NEEDS | NASA End-To-End Data System | In English | → Data → Astronomy → United States  | 
| NEMS | NASA Equipment Management System | In English | → Maintenance and logistics → United States  | 
| NERVA | Nuclear Engine for Rocket Vehicle Application | In English | → Nuclear technology | 
| NESDIS | National Environmental Satellite Data and Information Service | In English | → Environmental protection | 
| NESP | Naval Extremely high frequency Satellite Program | In English | → Military engineering | 
| NESS | National Environmental Satellite Service | In English | → Threats to the environment | 
| NET | NASA Employee Team | In English | → United States | 
| NEVS | NASA Equipment Visibility System | In English | → United States | 
| NFS | NASA FAR Supplement | In English | → United States | 
| NGA | National Geospatial-Intelligence Agency | In English | → Central administration | 
| NGT | NASA Ground Terminal | In English | → United States | 
| NHB | NASA Handbook | In English | → United States | 
| NIFO | Neidentigita Fluganta Objekto = OVNI | Objet Volant Non Identifié | In French = OVNI | Objecte Volador No Identificat | In Catalan = НЛО | Неидентифициран летящ обект | In Bulgarian = OVNI | Objeto Volador No Identificado | In Spanish = UFO | Unidentifiziertes Flugobjekt | In German = UFO | Unidentified Flying Object | In English = UFO | Unknown Flying Object | In English = UFO | Uidentificeret flyvende objekt | In Danish = UFO | Unbekend fleanend objekt | In Frisian = עב"מ | עצם בלתי מזוהה | In Hebrew = OVNI | Oggetto Volante Non Identificato | In Italian = NLO | Neidentificēts lidojošs objekts | In Latvian = UFO | Uidentifisert flygende objekt | In Norwegian = UFO | Uidentifisert flygande objekt | In Nynorsk = NOL | Niezidentyfikowany Obiekt Latający | In Polish = OVNI | Objeto Voador Não Identificado | In Portuguese = OZN | Obiect Zburător Neidentificat | In Romanian = НЛО | Неопознанный летающий объект | In Russian = NLO | Neidentifikovani leteći objekat | In Serbo-Croatian  | 
In Esperanto | |
| NLO | Neidentificēts lidojošs objekts = NIFO, OVNI, НЛО, UFO, עב"מ, NOL, OZN (look above)  | 
In Latvian | |
| NLO | Neidentifikovani leteći objekat = NIFO, OVNI, НЛО, UFO, עב"מ, NOL, OZN (look above)  | 
In Serbo-Croatian | |
| NLR | Nationaal Lucht- en Ruimtevaartlaboratorium | In Dutch | → Research institutes → Aeronautics, aircraft  | 
| NMI | NASA Management Instruction | In English | → Management → United States  | 
| NOES | National Operational Environmental Satellite | In English | → Threats to the environment | 
| NOL | Niezidentyfikowany Obiekt Latający = NIFO, OVNI, НЛО, UFO, עב"מ, NLO, OZN (look above)  | 
In Polish | |
| NOPAR | Nonorbiter Parts Authorization Request | In English | |
| NORAD | North American Aerospace Defense Command | In English | → Military engineering → Aeronautics, aircraft  | 
| NOSS | National Oceanic Satellite System | In English | → Marine research, oceanography | 
| NPC | NASA Procurement Circular | In English | → United States | 
| NPC | NASA Publication Control | In English | → United States | 
| NPD | NASA Policy Directive | In English | → Management → United States  | 
| NPN | NASA Part Number | In English | → United States | 
| NPS | NASA Planning Studies | In English | → United States | 
| NPS | Nonpropulsive Stage | In English | |
| NPSS | NASA Packet Switching System | In English | → Telecommunications | 
| NRA&A | Nouvelle Revue d'Aéronautique et d'Astronautique | In French | → Serial publications, periodicals → Aeronautics, aircraft  | 
| NRALT | NASA Radar Altimeter | In English | → Geodesy, cartography → United States  | 
| NRDS | Nuclear Rocket Development Station | In English | → Nuclear technology | 
| NS | Nuclear Shuttle | In English | → Nuclear technology | 
| NSC | NASA Standard Computer | In English | → Computer hardware → United States  | 
| NSD | NASA Standard Detonator | In English | → United States | 
| NSI | NASA Science Internet | In English | → Internet → Astronomy → United States  | 
| NSI | NASA Standard Initiator | In English | → United States | 
| NSIF | Near-Space Instrumentation Facility | In English | → Astronomy | 
| NSLD | NASA Shuttle Logistics Depot | In English | → Maintenance and logistics → United States  | 
| NSO | NASA Support Operation | In English | → United States | 
| NSP | NASA Support Plan | In English | → United States | 
| NSTI | NASA Simulation Traffic Interface | In English | → Computer simulation → United States  | 
| NSTL | National Space Technology Laboratories | In English | → Research institutes → Astronomy  | 
| NSTS | National Space Transportation System | In English | |
| NTD | NASA Test Director | In English | → United States | 
| NTS | Navigation Technology Satellite | In English | |
| NTSO | NASA Test Support Office | In English | → United States | 
| NUAAJ | Nanjing University Aeronautics and Astronautics Journal | In English | → Serial publications, periodicals → Higher education, universities → Aeronautics, aircraft → China  | 
| NuSTAR | Nuclear Spectroscopic Telescope Array | In English | → Astronomy | 
| NV | NASA Altimeter Verification | In English | → United States | 
| NVR | NASA Waiver | In English | → United States | 
| OAA | Orbiter Access Arm | In English | |
| OAA | Orbiter Alternate Airfield | In English | |
| OAC | Orbital Activation and Checkout | In English | |
| OAFD | Orbiter Aft Flight Deck | In English | |
| OAFTO | Orbiter Atmospheric Flight Test Office | In English | → Aeronautics, aircraft | 
| OAME | Orbital Attitude and Maneuvering Electronics | In English | → Electronics | 
| OAMS | Orbital Attitude and Maneuvering System | In English | |
| OAO | Orbital Astronomical Observatory | In English | → Observatories | 
| OARE | Orbital Acceleration Research Experiment | In English | → Astronomy | 
| OARS | Orbiter Avionics Radiation Specification | In English | → Aeronautics, aircraft | 
| OAS | Orbiter Aeroflight Simulator | In English | → Aeronautics, aircraft | 
| OAS | Orbiter Atmospheric Simulator | In English | → Aeronautics, aircraft | 
| OAS | Orbiter Avionics Simulator | In English | → Aeronautics, aircraft | 
| OAS | Orbiter Avionics System | In English | → Aeronautics, aircraft | 
| OASCB | Orbiter Avionics Software Control Board | In English | → Software → Aeronautics, aircraft  | 
| OASM | Office of Aerospace Medicine | In English | → Medicine → Aeronautics, aircraft  | 
| OAST | Office of Aeronautics and Space Technology | In English | → Aeronautics, aircraft | 
| OATS | Orbiter Avionics Tracking System | In English | → Aeronautics, aircraft | 
| OCA | Orbiter Capability Analysis | In English | |
| OCA | Orbiter Capability Assessment | In English | |
| OCAC | Orbiter Cabin Air Cleaner | In English | |
| OCCP | Orbit Command Computer Program | In English | → Computer programs | 
| OCDR | Orbiter Critical Design Review | In English | |
| OCF | Orbiter Computational Facilities | In English | → Computer hardware | 
| OCH | Orbiter Common Hardware | In English | → Computer hardware | 
| OCTW | Optical Communications Through the shuttle Window | In English | |
| ODF | Orbit Determination Facility | In English | → Astronomy | 
| ODIN | Orbital Design Integration System | In English | |
| ODM | Orbiter Disconnect Mechanism | In English | |
| ODRC | Orbiter Data Reduction Center | In English | → Data | 
| OEAS | Orbital Emergency Arresting System | In English | |
| OECS | Orbital Express Capture System | In English | |
| OES | Orbiter Emergency Site | In English | |
| OET | Orbiter Engineering and Test | In English | |
| OEX | Orbiter Experiment | In English | |
| OF | Orbital Flight | In English | |
| OFDS | Orbiter Flight Dynamic Simulator | In English | → Computer simulation | 
| OFI | Operational Flight Instrumentation | In English | → Aeronautics, aircraft | 
| OFK | Optical Flight Kit | In English | → Aeronautics, aircraft | 
| OFP | Operational Flight Profile | In English | → Aeronautics, aircraft | 
| OFP | Operational Flight Program | In English | → Aeronautics, aircraft |