List of acronyms: M
(Main list of acronyms)
- m – Metre – Milli
- M – Mega- – One thousand
MA
- mA – Milliampere
- Ma – Megaannum
- MA
- * Madagascar
- * Marijuana Anonymous
- * Master of Arts
- * Massachusetts
- * Megaampere
- * Morocco
- MAA – Mathematical Association of America
- MAAC – Metro Atlantic Athletic Conference
- MAC
- * Macau
- * U.S. Military Airlift Command
- * Mid-American Conference
- MACA – Military aid to the civil authorities
- MACE – Multi-agent computing environment
- MACHO – Massive compact halo object
- MAD
- * Magnetic anomaly detector
- * Moroccan dirham
- * Mutual assured destruction
- MADD
- * Mothers Against Drunk Driving
- * Myoadenylate deaminase deficiency
- * Multiply–add
- MAF – Maintenance action form
- MAFF - Ministry of Agriculture, Forestry and Fisheries
- MAGIC – Major Atmospheric Gamma-ray Imaging Cherenkov
- MAGNETAR –
- MAGTF – Marine Air-Ground Task Force
- mah – Marshallese language
- Mahasz – Magyar Hanglemezkiadók Szövetsége
- mal – Malayalam language
- MALD – Miniature Air-Launched Decoy
- MANPADS – MAN-portable air defence system
- MANPRINT – Mapower and personnel integration
- MAO
- * Molėtų astronomijos observatorija
- * Monoamine oxidase
- MAOI – Monoamine oxidase inhibitor
- MAP – Management action plan
- MAPP - Medical assistance premium program
- MAPS – Monitoring Avian Productivity and Survivorship
- MAQS – Museum of the American Quilter's Society
- mar – Marathi language
- MAR – Morocco
- MarBEF – Marine biodiversity and ecosystem functioning
- MARC
- * Machine readable cataloging
- * Mailing list archive
- * Maryland Area Regional Commuter train service
- * Massachusetts Animal Rights Coalition
- * Mid-America Regional Council
- MARCENT – United States Marine Forces Central Command
- MARFORCC – Marine Force Component Commander
- MARINE Muscles Are Required, Intelligence Not Evaluated- Used by Enlisted and Officer Ranks in the USMC
- MARINES My A** Rides In Navy Equipment, Sir! - Banter with Navy Personnel by Marines
- MARRS – Martyn Young, Alex Ayuli, Rudy Tambala, Russell Smith, and Steve Young
- MAS – NATO Military Agency for Standardization
- MASAS – Monte Agliale Supernovae and Asteroid Survey
- Maser – Microwave Amplification by Stimulated Emission of Radiation
- MASH – Mobile Army Surgical Hospital
- MASINT – Measurement And Signature Intelligence
- MATREX – Modeling Architecture for Technology, Research & EXperimentation
- MATS – U.S. Military Air Transport Service
- MAVS – Mobile Artillery Vehicle System
- MAW – Malawi
- MAX – Meta-reasoning Architecture for "X"
MB
- MB
- * Manitoba
- * Martinique
- * Medal of Bravery
- MBA
- * Main Battle Area
- * Main Belt Asteroid
- * Master of Business Administration
- MBI – Moody Bible Institute
- MBBL – Mounted Battlespace Battle Laboratory
- MBCC – Migratory Bird Conservation Commission
- MBCS – Multi-Byte Character Set
- MBE
- * Member of the Order of the British Empire
- * Multistate Bar Examination
- MBIDST – Member of the British Institute of Dental and Surgical Technologists
- MBM – Meat and Bone Meal
- MBR - Master boot record
- MbS – Mohammad bin Salman
- MBSE – Model-based systems engineering
- mbsf – metres below sea floor, a depth convention used in paleontology and oceanography
- MBT – Main Battle Tank
- MBTA – Massachusetts Bay Transportation Authority – Migratory Bird Treaty Act
- MBTI – Myers-Briggs Type Indicator
MC
- mC – Millicoulomb
- MC
- * Macau
- * Master of ceremonies
- * Megacoulomb
- * Military Cross
- * Monaco
- * Mortar carrier
- * Eleven hundred
- MCA
- * Master of Computer Applications
- * Micro Channel Architecture
- * Multichannel analyzer
- * Music Corporation of America, the original name of the now-defunct MCA Inc.
- * Malaysian Chinese Association
- MCC
- * Marylebone Cricket Club
- * Mission control center
- * Motor control center
- * Movement control centre
- MCD
- * Minimal Cerebral Dysfunction
- * Minor civil division
- MCDL – Model Composition Definition Language
- MCFT – Modified compression field theory
- MCG – Melbourne Cricket Ground
- MC&G – Mapping, charting, and geodesy
- MCI – Microwave Communications, Inc.
- MCIS – Mellon Collie and the Infinite Sadness
- MCM – Mine Counter-Measures
- MCMV – Mine Counter-Measure Vessel
- MCNC
- * Microelectronics Center of North Carolina
- * Mixing Condensation Nucleus Counter
- MCO
- * Major Combat Operation
- * Monaco
- * Orlando International Airport
- * Movement Control Officer
- MCP
- * Maintenance Collection Point
- * Male Chauvinist Pig
- MCR – My Chemical Romance
- MCSF – Marine Corps Security Forces
- MCT – Movement Control Team
- MCTIS – Mounted Co-operative Target Identification System
- MCU
- * Marine Corps University
- * Marvel Cinematic Universe
- * Medium close-up
- * Microcontroller unit
- * Milk clotting units
- * Ming Chuan University
- * Minimum coded unit
- * Multipoint control unit
- * Municipal Credit Union
- MCWS – Men's College World Series, the final phase of the NCAA Division I baseball tournament in the US
MD
- Md – Mendelevium
- MD
- * Fifteen Hundred
- * Maryland
- * Medicinae Doctor
- * Mentioned in Dispatches
- * Moldova
- MDA
- * Main Defensive Action/Area
- * Moldova
- * Muscular Dystrophy Association
- MDF
- * Main distribution frame
- * Medium-density fiberboard
- MDG
- * Madagascar
- * UN Millennium Development Goal
- MDL – Moldovan leu
- MDM
- * Michigan Dartmouth MIT telescope consortium
- * Master data management
- MDMA – MethyleneDioxy-MethylAmphetamine
- MDNA – Madonna's 12th studio album title
- MDO – Membership Driven Organisation
- MDP – Markov Decision Process
- MDT – Mountain Daylight Time
- MDS
- MDV – Maldives
- MDW
- * Chicago Midway International Airport in Chicago
- * Military District of Washington
- * Minnesota, Dakota and Western Railway
- * Mother’s Day Weekend
ME
- Me – Messerschmitt
- ME
- * Maine
- * Mechanical engineer
- * Medical examiner
- * Middle East
- * Middle East Airlines
- * Memory Effect – Myalgic Encephalomyelitis
- MEA
- * Maine Educational Assessment
- * Middle East Airlines
- * Millennium Ecosystem Assessment
- * Minimum en route altitude
- * Mono-ethanol Amine
- * Multilateral Environmental Agreement
- MEAC – Mid-Eastern Athletic Conference
- MEC
- * Maine Central Railroad
- * Manta, Ecuador
- * Model European Council
- * Mountain East Conference
- * Mountain Equipment Co-op
- MECC – Minnesota Educational Computing Consortium
- MECCA – Milwaukee Exposition Convention Center and Arena, a former name for the sports venue now known as UW–Milwaukee Panther Arena
- MECO – Main engine cutoff
- MEDEVAC – Medical evacuation
- MEDLI
- * Mars Science Laboratory Entry, Descent, and Landing Instrumentation
- * Medical & Scientific Libraries of Long Island
- * Model for Effluent Disposal using Land Irrigation
- MEDS – Mission Essential Data Set
- MEF
- * U.S. Marine Expeditionary Force
- * Minimum essential facility
- * Mission essential force
- MEG – MagnetoEncephaloGraphy
- MEI – Matsushita Electric Industrial Co., Ltd.
- MEK
- * Magyar Elektronikus Konyvtar
- * Message encryption key
- * methyl ethyl ketone
- * Mujahideen al-Khalq
- MEL
- * Maya Embedded Language
- * Michigan Electronic Library
- MELT – Metallic Line/Loop Test
- MEM
- * Message Exchange Mechanism
- * Microelectromechanical
- MEMS – Microelectromechanical System
- MENA – Middle East and North Africa
- MEO
- * Medium Earth orbit
- * Most efficient organization
- MEP
- * Mechanical Electrical Plumbing
- * Member of the European Parliament
- *Missions étrangères de Paris
- * Model European Parliament
- MER – Mars Exploration Rover
- MERL – Mitsubishi Electric Research Laboratories
- MES
- * Marconi Electronic Systems
- * Medium Edison screw
- MESSENGER – MErcury Surface, Space ENvironment, GEochemistry and Ranging
- MET
- * Meteorological
- * Middle European Time
- METAR – Aviation Routine weather report
- METL – Mission Essential Task List
- METOC – Meteorological and Oceanographic
- METT-T – Mission, Enemy, Terrain, Troops, and Time available
- METT-TC – Mission, Enemy, Terrain, Troops, Time and Civilian considerations
- MEU
- * U.S. Marine Expeditionary Unit
- * Maximum Expected Utility
- MeV – Megaelectronvolt
- MEV
- * Medical Evacuation Vehicle
- * Musica Elettronica Viva
- MEX – Mexico
- MEZ – Missile Engagement Zone
- MES – Manufacturing Execution Systems
MF
- mF – Millifarad
- MF
- * Mayotte
- * Megafarad
- * Motherf***er
- MFG - Manufacturing
- MFSB – Mother, Father, Sister, Brother
- MFT
- * Managed file transfer
- * Master File Table
- * Mean field theory
- * Media Foundation Transform
- * Micro Four Thirds
MG
- mg – Malagasy language – Milligram
- Mg – Magnesium – Megagram
- MG – Machine Gun – Madagascar – Major General – Mongolia – Morris Garage
- MGA – Malagasy ariary
- MGB – Medium Girder Bridge, Motor Gun Boat
- MGM – Metro Goldwyn Mayer – Montgomery, Alabama
- MGPAM – My Gym Partner's a Monkey
- MGS – Mobile Gun System
MH
- mh – Marshallese language
- mH – Millihenry
- MH
- * Marshall Islands
- * Megahenry
- * Montserrat
- * Malaysia Airlines
- MHC – Major histocompatibility complex
- MHEV – Micro-Hybrid Electric Vehicle
- MHHW – Mean Higher High Water
- MHL – Marshall Islands
- MHLW – Mean Higher Low Water
- MHRA – Medicines and Healthcare products Regulatory Agency
- MHW – Mean High Water
- MHWN – Mean High Water Neaps
- MHWS – Mean High Water Springs
- MHz – Megahertz
MI
- mi – Māori language
- Mi – Mebi
- MI
- * Malawi
- * Michigan
- * Midway Islands
- * Military Intelligence
- MIA
- * Missing In Action
- * Miami International Airport
- MIAA
- * Maryland Interscholastic Athletic Association
- * Massachusetts Interscholastic Athletic Association
- * Michigan Intercollegiate Athletic Association
- * Mid-America Intercollegiate Athletics Association
- MIB
- * Men In Black
- * Mint In Box
- MIC
- * Military Industrial Complex
- * Malaysian Indian Congress
- MICE – Meetings, Incentives, Conferences, Exhibitions tourism
- MICLIC – Mine Clearing Line Charge
- MICOM – Missile Command
- MICV – Mechanised Infantry Combat Vehicle
- MID – Midway Islands
- MIDI – Musical Instrument Digital Interface
- MIDAS – Man-machine Integration Design and Analysis System
- MIDS – Multi-Function Information Distribution System
- MIFC – Military Industrial Financial Complex
- MIFG – Shallow Fog
- MIFPC – Military Industrial Financial Pharmaceutical Complex
- MIKE – Monitoring of Illegal Killing of Elephants
- MIL – Man-In-the-Loop
- MIL-AASPEM – Man-In-the-Loop AASPEM
- MILAN – Missile d´infanterie léger antichar
- MiLB – Minor League Baseball
- MILC – Mirrorless interchangeable-lens camera
- MILES – Multiple Integrated Laser Engagement System
- MILF
- * Moro Islamic Liberation Front
- * Mother I'd Like to Fuck
- MILSATCOM – Military Satellite Communications
- MILSET –
- MILSTRIP – Military Standard Requisitioning and Issue Procedure
- Mimaropa – Mindoro, Marinduque, Romblon, Palawan
- MIMOSA – MIcroMeasurements Of Satellite Acceleration
- MIMPT – Member of the Institute of Maxillofacial Prosthetists and Technologists
- MIP
- * Multilateral Interoperability Programme
- * Multiple Identity Poster
- MIPC – Military Industrial Pharmaceutical Complex
- MIRA – MILAN Infra-Red Acquisition
- MIRV – Multiple Independent Reentry Vehicle
- MIS
- * Management Information Systems
- * Museum Information System
- MISREP – Mission Report
- MISSI – Multilevel Information System Security Initiative
- MIT
- * Massachusetts Institute of Technology
- * methylisothiazoline
- * Milli Istihbarad Teskilati
- MITL – Man-In-The-Loop
- MITS – ''see entry''
MJ
- mJ – Millijoule
- MJ
- * Megajoule
- * Michael Jordan
- * Michael Jackson
- * Mary Jane Watson
- MJD – Modified Julian Day
- MJF – Maxwell Jacob Friedman, American professional wrestler
- MJP – Military Judgement Panel
MK
- mk – Macedonian language
- mK – Millikelvin
- Mk - Mark, as in Mk 18 MOD 0 CQBR
- MK
- * Air Mauritius
- * Macedonia
- * Mandalskameratene
- * Megakelvin
- * Milton Keynes
- * Missionary Kids
- * Mortal Kombat (1992 video game)
- * Mortal Kombat (2011 video game)
- mkd – Macedonian language
- MKD
- * Macedonian denar
- * North Macedonia
- MKG – Michael Kidd-Gilchrist
- MKO – Mojahedin-e-Khalq Organization
- MKS
- * Metre–Kilogram–Second
- * MKS Inc. software company
- MKSA – Metre–Kilogram–Second–Ampere
- MKT
- * Missouri-Kansas-Texas Railroad
- * Mortal Kombat Trilogy
- * Short form of Marketing
ML
- ml – Malayalam language
- mL – Millilitre
- ML
- * Mali
- * Maximum Likelihood
- * Megalitre
- MLA
- * Martial Law Administration of Bangladesh
- * Master of Landscape Architecture
- * Medical Library Association
- * Member of Legislative Assembly
- * Modern Language Association
- * Mutual legal assistance treaty
- * Myelosis Leucemica Acuta
- MLB
- * Major League Baseball
- * Melbourne Orlando International Airport
- MLC – Member of the Legislative Council
- MLE – Maximum likelihood estimation
- mlg – Malagasy language
- MLG
- * Major League Gaming
- * Main Landing Gear
- MLHW – Mean Lower High Water
- MLI – Mali
- MLK – Martin Luther King Jr.
- MLL – Major League Lacrosse
- MLLW – Mean Lower Low Water
- MLP – My Little Pony
- MLR
- * Medical Loss Ratio
- MLRS – Multiple-Launch Rocket System
- MLS
- * Major League Soccer
- * Multiple Listing Service
- * Multilevel security
- MLSE
- * Maple Leaf Sports & Entertainment
- * Maximum likelihood sequence estimation
- MLSR – Missing, Lost or Stolen Report
- mlt – Maltese language
- MLT – Malta
- MLVW – Medium Logistics Vehicle, Wheeled
- MLW
- * Major League Wrestling
- * Mean Low Water
- MLWN – Mean Low Water Neaps
- MLWS – Mean Low Water Springs
MM
- mm – Millimetre
- Mm – Megametre
- MM – Military Medal – Myanmar – Two Thousand
- MMA – Mixed martial arts – Moving Mechanical Assembly
- MMC – Machinist's Mate, Chief – Materiel Management Centre
- MMCM – Machinist's Mate, Master Chief – Magnetic Mine Counter Measure
- MMCS – Machinist's Mate, Senior Chief
- MMEV – Multi-Mission Effects Vehicle
- MMI – Man-Machine Interface
- MMI – McLean Meditation Institute
- MMIC – Mindfulness & Meditation Instructor, Certified
- MMIC – McLean Meditation Institute Certified
- MMI – Magical MonkeyZ Inc.
- MMIO – Memory-mapped I/O
- MMK – Burmese kyat
- MMO – Massively Multiplayer Online
- MMOR – Master of Management in Operations Research
- MMORPG – Massively multiplayer online role-playing game
- MMPR – Mighty Morphin Power Rangers
- MMR – Measles, Mumps and Rubella vaccine – Myanmar
- MMS – Multimission Modular Spacecraft
- MMU – Manchester Metropolitan University – Manned Manoeuvring Unit
- MMW – Millimetre Wave
MN
- mn – Mongolian language
- mN – Millinewton
- Mn – Manganese
- MN – Meganewton – Minnesota – Monaco – Mongolia
- MNB – Multinational Brigade
- MNB C – Multinational Brigade Centre
- MND – Motor Neurone Disease – Multinational Division
- MNE – Montenegro
- MNG – Multiple-image Network Graphics – Mongolia
- MNMF – Multi-National Maritime Force
- MNP – Northern Mariana Islands
- MNS – Mission Needs Statement
- MNT – Molecular nanotechnology – Mongolian tugrik
MO
- mo – Moldovan language
- Mo – Molybdenum
- MO – Macau – Medical Officer – Missouri – modus operandi – Morocco
- MOA – Museum of Art
- MOAB – Massive Ordnance Air Blast – Mother Of All Bombs
- MOB – Man Over Board – Marching Owl Band – Movable Object Block
- MOC – Macedonian Orthodox Church – Measure Of Capability – Mission Operations Centre – My Own Creation
- MOCAS – Mechanization Of Contract Administration Services
- MoD – Ministry of Defence (United Kingdom) and various other countries
- MOD – Magneto-optical disc – Masters of Deception – Minimum Object Distance – Multiple Organ Dysfunction
- MoDAF – Ministry of Defence Architecture Framework
- modem – Modulator-Demodulator
- ModSAF – Modular Semi-Automated Forces
- Moe – Marvel of entertainment
- MOE – Measure Of Effectiveness
- MOF – Ministry of Finance (Japan)
- MOFA – Ministry of Foreign Affairs (Japan)
- MOH – Medal of Honor – Music On Hold
- MOID – Minimum Orbital Intersection Distance
- MOJWA – Movement for Oneness and Jihad in West Africa
- mol – Moldovan language – mole (unit)
- MOLO – Mobile Other Licensed Operator
- MoM – Multiple of the median
- MOM – Message-oriented middleware
- MOM – Master's Degree in Oriental medicine
- MoMA – Museum of Modern Art
- mon – Mongolian language
- MOND – Modified Newtonian Dynamics
- MOO – Measure Of Outcome
- MOOTW – Military Operations Other Than War
- MOP – Macau pataca – Measure Of Performance
- MOPE – Ministry of Population and Environment – Most Oppressed People Ever
- MOPP – Mission-Oriented Protective Posture
- MORP – Meteorite Observation and Recovery Project
- MORS – Military Operations Research Society
- MOS – Military Occupational Specialty – – Mobile Object System – Model Output Statistics – Multiplayer Online Services - Mean Opinion Score
- MOS-CQ - Mean Opinion Score - Conversational Quality
- MOS-LQ - Mean Opinion Score - Listening Quality
- MOSFET – Metal-Oxide-Semiconductor Field-Effect Transistor
- MOSS – MObile Submarine Simulator – Moving Object Support System
- MOT – Ministry of Transport
- MOTA – Member of the Orthodontic Technicians Association
- MOTESS – Moving Object and Transient Event Search System
- MOTO – Mail Order / Telephone Order – Master of the obvious
- MOU – Memorandum Of Understanding
- MOUT – Military Operations in Urban Terrain
- MOVES – Modeling, Virtual Environments, and Simulation Institute
- MOW – Maintenance of way
- MOZ – Mozambique
MP
- MP – Magic points – Mauritius – Member of Parliament – Military Police – Missouri Pacific – Northern Mariana Islands
- mPa – Millipascal
- MPa – Megapascal
- MPA - Master of Public Administration
- MPA – Maritime Patrol Aircraft
- MPAA – Motion Picture Association of America
- MPC – Minor Planet Center – Minor Planet Circular
- MPC – Military Payment Certificate
- MPEC – Minor Planet Electronic Circular
- MPEG – Motion Pictures Experts Group
- MPEV – Multi-Purpose Engineering Vehicle
- MPF – Maritime Prepositioning Force
- MPFC – Medial PreFrontal Cortex
- MPG - Miles Per Gallon
- MPMC – Medial PreMotor Cortex
- MPSI – Member of the Pharmaceutical Society of Ireland
- MPSoC – MultiProcessor System-on-Chip
- MPSRON – Maritime Propositioning Ship Squadron
MQ
- MQ
- * Martinique – Midway Islands
- * Multi-mission Unmanned Aerial Vehicle (US tri-service aircraft designator)
MR
- mr – Marathi language
- MR – Mauritania
- * Model Railroader Magazine
- MR-ATGW – Medium-Range Anti-Tank Guided Weapon
- MRAV – Multi-Role Armoured Vehicle
- MRBM – Medium Range Ballistic Missile
- MRC – Maintenance Requirements Card
- MRD – Motorized Rifle Division
- MRE – Meal Ready to Eat
- MRGO – Mississippi River–Gulf Outlet Canal
- MRGW – Medium-range guided weapon
- mri – Māori language
- MRI – Magnetic resonance imaging
- MRL – Multiple rocket launcher
- * Montana Rail Link
- MRO
- * Maintenance, repair and operations
- * Mars Reconnaissance Orbiter
- * Mauritanian ouguiya
- MRPharmS – Member of the Royal Pharmaceutical Society
- MRR – My Restaurant Rules
- MRS – Magnetic Resonance Spectroscopy
- MRSA – Methicillin-resistant Staphylococcus aureus
- MRT
- * Mass Rapid Transit — used as either an official or unofficial name for metro systems in Singapore, Kaohsiung, Bangkok, Taipei, Chennai, and Delhi
- * Mauritania
- MRTFB – U.S. Major Range and Test Facility Base
MS
- ms
- * Malay language
- * Millisecond
- mS – Millisiemens
- Ms – Megasecond
- MS
- * mano sinistra
- * manuscript
- * Master of Science
- * Megasiemens
- * Microsoft
- * Mississippi
- * Montserrat
- * Multiple Sclerosis
- M&S
- * Modelling & Simulation
- * Marks & Spencer
- MSA – Malay language
- MSB
- * Main Support Battalion
- * Most Significant Bit
- MSD – Minimum Safe Distance
- MSDB – Multi Source Data Base
- MSDE
- * Maryland State Department of Education
- * Microsoft Data Engine
- * Microsoft SQL Server 2000 Desktop Engine
- * Military Scenario Development Environment
- * Mission Simulation Dynamic Engine
- MSDL – Military Scenario Definition Language
- MSE – Multiple Subscriber Element
- MSFS - Microsoft Flight Simulator
- MSEC – Message Security Encryption Code
- MSG
- * MonoSodium Glutamate
- * Madison Square Garden
- MSH
- * Medium Support Helicopter
- * Mount St. Helens
- MSI
- * Micro-Star International
- * Multispectral imagery
- MSIE
- * Microsoft Internet Explorer
- * Master of Science in Industrial Engineering
- MSL
- * Mars Science Laboratory
- * Mean Sea Level
- * Missile
- MSLP – Mean Sea Level Pressure
- MSM
- * Mainstream media
- * Men who have sex with men
- * Mount St Mary's School
- MSN
- * Microsoft Network
- * Master of Science in Nursing
- MSNBC – Microsoft National Broadcasting Company Cable news channel
- MSO – Multiple System Operator
- MSP
- * Member of the Scottish Parliament
- * Minneapolis–Saint Paul - Twin cities in Minnesota
- * Minneapolis–Saint Paul International Airport
- MSPA
- * Migrant and Seasonal worker Protection Act
- * MS Paint Adventures
- MSPB – Merit Systems Protection Board
- MSR
- * Main Supply Route
- * Module Service Record
- * Montserrat
- * Motor Schlepp Regulung
- * Mountain Safety Research
- MSSA
- * Member of the Order of the Star of South Africa
- * Methicillin-susceptible Staphylococcus aureus
- * Military Selective Service Act
- * Military-style semi-automatic
- * Mind Sports South Africa
- * Montreal Student Space Associations
- * MSSA Chemical Company, formerly known as Métaux Spéciaux.
- MST
- * Madison Symmetric Torus
- * Mountain Standard Time
- * Maastricht Aachen Airport
- MST3K or MST3k – Mystery Science Theater 3000
- MSU
- * Michigan State University
- * Montana State University
- * Mountain State University
- * Lomonosov Moscow State University
MT
- mt – Maltese language
- mT – Millitesla
- Mt – Meitnerium
- MT
- * Malta
- * Megatesla
- * Montana
- * Motor Transport
- MTA
- * Metropolitan Transportation Authority (Boston)
- * Metropolitan Transportation Authority
- MTBF – Mean time between failures
- MtF – Male-to-female transsexual
- MTF
- * Magnetized target fusion
- * Medical Treatment Facility
- * Message Text Format
- * Modulation transfer function
- MTG – Magic: The Gathering
- MTL
- * Maltese lira
- * Mean Tide Level * MTM – Methods-Time Measurement
- MTOE – Modified Table of Organization and Equipment
- MTP
- * Maritime Tactical Publication
- * Materiel Transfer Plan
- * Mission Training Plan
- MTQ – Martinique
- MTR
- * Main and Tail Rotor
- * Mass Transit Railway
- * Military-Technological Revolution
- MTS
- * Maintenance Training System
- * Manitoba Telephone System and Manitoba Telecom Services, former names of Bell MTS
- * Michigan Terminal/Timesharing System
- * Movement Tracking System
- * Multichannel television sound
- * Multi-Technical Services
- MTT – Methylthiazol tetrazolium
- MTU
- * Tankovei Mostoukladchik
- * Motoren- und Turbinen-Union
- MTV
- * MainosTeleVisio
- * Music TeleVision
- MTVL – Mobile Tracked Vehicle, Light
- MTWS – MAGTF Tactical Warfare System
MU
- MU
- * Mauritius
- * Oman
- * Manchester United
- MUA
- * Meritorious Unit Award
- * Military Utility Assessment
- * Make-up Artist
- MUR – Mauritius rupee
- MUS – Mauritius
MV
- mV – Millivolt
- MV – Maldives – Megavolt – Motor Vehicle – Motor Vessel
- MVC – Missouri Valley Conference
- MVFC – Missouri Valley Football Conference
- MVNO – Mobile virtual network operator
- MVP – Most Valuable Player
- MVR – Maldivian rufiyaa
MW
- mW – Milliwatt
- MW
- * Maintenance of way
- * Malawi
- * Medium Wave
- * Megawatt
- * Mountain West (Conference)
- MWC
- * Maritime Warfare Centre
- * Mountain West Conference
- MWESH – Machismo Wizards Extended SHelter
- MWI – Malawi
- MWK – Malawian kwacha
- MWOA – Mount Wilson Observatory Association
- MWR – Morale, Welfare, and Recreation
- MWTB - Mounted Warfare Test Bed
MX
- MX – Mail Exchange – Mexico – Missile eXperimental
- MXN – Mexican peso
MY
- my – Burmese language
- MY – Malaysia
- mya – Burmese language – million years ago
- MYOB – Mind Your Own Business
- MYR – Malaysian ringgit
- MYS – Malaysia
- MYT – Mayotte
MZ
- MZ – Mach-Zehnder (interferometer) – Magnetic Azimuth – Move, Zig – Mozambique
- MZN – Mozambique metical