MA
- mA – (s) Milliampere
- Ma – (s) Megaannum
- MA
- (s) Madagascar (FIPS 10-4 country code)
- (i) Marijuana Anonymous
- (i) Master of Arts
- Massachusetts (postal symbol)
- Megaampere
- Morocco (ISO 3166 digram)
- MAA – (i) Mathematical Association of America
- MAAC – (a) Metro Atlantic Athletic Conference
- MAC
- (s) Macau (ISO 3166 trigram)
- (a) U.S. Military Airlift Command (1966–1992)
- Mid-American Conference
- MACA – (i) Military Aid to the Civil Authorities
- MACE – (a) Multi-Agent Computing Environment
- MACHO – (p) MAssive Compact Halo Object
- MAD
- (a) Magnetic Anomaly Detector
- (s) Moroccan dirham (ISO 4217 currency code)
- (a) Mutual Assured Destruction
- MADD
- (a) Mothers Against Drunk Driving
- MyoAdenylate Deaminase Deficiency
- (p) Multiply–Add
- MAF – (i) Maintenance Action Form
- MAFF - (a) Ministry of Agriculture, Forestry and Fisheries (various countries)
- MAGIC – (a) Major Atmospheric Gamma-ray Imaging Cherenkov (telescope)
- MAGNETAR – (p) Metaprogrammable AGent NETwork ARchitecture
- MAGTF – (i) Marine Air-Ground Task Force
- mah – (s) Marshallese language (ISO 639-2 code)
- Mahasz – (p) Magyar Hanglemezkiadók Szövetsége (Hungarian, "Association of Hungarian Record Companies")
- mal – (s) Malayalam language (ISO 639-2 code)
- MALD – (a) Miniature Air-Launched Decoy
- MANPADS – (p) MAN-Portable Air Defence System
- MANPRINT – (p) MANpower and PeRsonnel INTegration
- MAO
- (i/a) Molėtų astronomijos observatorija (Moletai Astronomical Observatory)
- (p) MonoAmine Oxidase
- MAOI – (p) Monoamine oxidase inhibitor
- MAPS – (a) Monitoring Avian Productivity and Survivorship
- MAQS – (a) Museum of the American Quilter's Society ("max")
- mar – (s) Marathi language (ISO 639-2 code)
- MAR – (s) Morocco (ISO 3166 trigram)
- MarBEF – (p) Marine Biodiversity and Ecosystem Functioning
- MARC
- (a) MAchine Readable Cataloging (often also defined as MAchine Readable Code)
- Mailing list ARChive
- Massachusetts Animal Rights Coalition
- Mid-America Regional Council
- MARCENT – (p) United States Marine Forces Central Command
- MARFORCC – (p) Marine Force Component Commander
- MAS – (i) NATO Military Agency for Standardisation
- MASAS – (a) Monte Agliale Supernovae and Asteroid Survey
- Maser – (a) Microwave Amplification by Stimulated Emission of Radiation
- MASH – (a) Mobile Army Surgical Hospital
- MASINT – (p) Measurement And Signature Intelligence
- MATREX – (p) Modeling Architecture for Technology, Research & EXperimentation
- MATS – (a) U.S. Military Air Transport Service (1948–1966)
- MAVS – (a/i) Mobile Artillery Vehicle System
- MAW – (s) Malawi (IOC trigram, but not FIFA or ISO 3166)
- MAX – (i) Meta-reasoning Architecture for "X"
Read more about this topic: List Of Acronyms And Initialisms: M