| Acronym | Meaning |
 | MEL | Maya Embedded Language - Michigan Electronic Library |
| MEM | Message Exchange Mechanism -Microelectromechanical |
| MEMS | Microelectromechanical System |
| MEO | Medium Earth Orbit - Most Efficient Organization |
| MEP | Mechanical Electrical Plumbing - Member Of The European Parliament - Missions ?trang?res De Paris (French For Paris Foreign Missions) - Model European Parliament |
| MER | Mars Exploration Rover |
| MERL | Mitsubishi Electric Research Laboratories |
| MES | Marconi Electronic Systems - Medium Edison Screw |
| MET | Meteorological -Middle European Time |
| METAR | [Meteorological] Aviation Routine Weather Report |
| METL | Mission Essential Task List (mettle) |
| METOC | Meteorological And Oceanographic |
| METT | T -Mission |
| METT | TC -Mission |
| MEU | U.S. Marine Expeditionary Unit - Maximum Expected Utility |
| MEV | Medical Evacuation Vehicle - Musica Elettronica Viva |
| MEV | Megaelectron-volt |
| MEX | Mexico (ISO 3166 Trigram) |
| MEZ | Missile Engagement Zone |
| MF | Mayotte (FIPS 10-4 Territory Code) - Megafarad |
| MF | Millifarad |
| MG | Machine Gun -Madagascar (ISO 3166 Digram) -Major General -Mongolia (FIPS 10-4 Country Code) -Morris Garage |
| MG | Magnesium - Megagram |
| MG | Malagasy Language (ISO 639-1 Code) - Milligram |
| MGA | Malagasy Ariary (ISO 4217 Currency Code) |
| MGB | Medium Girder Bridge |
| MGM | Metro Goldwyn Mayer -Montgomery |
| MGPAM | My Gym Partner's A Monkey |
| MGS | Mobile Gun System |
| MH | Marshall Islands (postal Symbol; ISO 3166 Digram) - Megahenry - Montserrat (FIPS 10-4 Territory Code) |
| MH | Marshallese Language (ISO 639-1 Code) |
| MH | Millihenry |
| MHC | Major Histocompatibility Complex |
| MHHW | Mean Higher High Water (nautical Charts) |
| MHL | Marshall Islands (ISO 3166 Trigram) |
| MHLW | Mean Higher Low Water (nautical Charts) |
| MHRA | (UK) Medicines And Healthcare Products Regulatory Agency |
| MHW | Mean High Water (nautical Charts) |
| MHWN | Mean High Water Neaps (nautical Charts) |
| MHWS | Mean High Water Springs (nautical Charts) |
| MHZ | Megahertz |
| MI | Malawi (FIPS 10-4 Country Code) - Michigan (postal Symbol) - Midway Islands (ISO 3166 Digram; Obsolete 1986) -Military Intelligence |
| MI | M?ori Language (ISO 639-1 Code) |
| MI | Mebi |
| MIA | Missing In Action |
| MIB | Men In Black - Mint In Box (Internet Auction/trading Listings) |
| MICLIC | Mine Clearing Line Charge |
| MICOM | Missile Command |
| MICV | Mechanised Infantry Combat Vehicle |
| MID | Midway Islands (ISO 3166 Trigram; Obsolete 1986) |
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