| Acronym | Meaning |
 | MLLW | Mean Lower Low Water (nautical Charts) |
| MLRS | Multiple-Launch Rocket System |
| MLS | Major League Soccer -Multiple Listing Service |
| MLSR | Missing |
| MLT | Malta (ISO 3166 Trigram) |
| MLT | Maltese Language (ISO 639-2 Code) |
| MLVW | Medium Logistics Vehicle |
| MLW | Mean Low Water (nautical Charts) |
| MLWN | Mean Low Water Neaps (nautical Charts) |
| MLWS | Mean Low Water Springs (nautical Charts) |
| MM | Military Medal -Myanmar (ISO 3166 Digram) - Two Thousand (in Roman Numerals) |
| MM | Megametre |
| MM | Millimetre |
| MMA | Moving Mechanical Assembly |
| MMC | Machinist's Mate |
| MMCM | Machinist's Mate |
| MMCS | Machinist's Mate |
| MMEV | Multi-Mission Effects Vehicle |
| MMI | Magical MonkeyZ Inc. |
| MMI | Man-Machine Interface |
| MMK | Burmese Kyat (ISO 4217 Currency Code) |
| MMO | Massively Multiplayer Online (computer Game) |
| MMOR | Master Of Management In Operations Research |
| MMPR | Mighty Morphin Power Rangers |
| MMR | Measles |
| MMS | Multimission Modular Spacecraft |
| MMU | Manchester Metropolitan University -Manned Manoeuvring Unit |
| MMW | Millimetre Wave (radar |
| MN | Manganese |
| MN | Meganewton - Minnesota (postal Symbol) - Monaco (FIPS 10-4 Country Code) - Mongolia (ISO 3166 Digram) |
| MN | Millinewton |
| MN | Mongolian Language (ISO 639-1 Code) |
| MNB | Multinational Brigade |
| MNB C | Multinational Brigade Centre (KFOR) |
| MND | Motor Neurone Disease -Multinational Division |
| MNG | Mongolia (ISO 3166 Trigram) |
| MNMF | Multi-National Maritime Force |
| MNP | Northern Mariana Islands (ISO 3166 Trigram) |
| MNS | Mission Needs Statement |
| MNT | Molecular Nanotechnology -Mongolian Tugrik (ISO 4217 Currency Code) |
| MO | Macao (ISO 3166 Digram) -Medical Officer -Missouri (postal Symbol) -modus Operandi (Latin |
| MO | Moldovan Language (ISO 639-1 Code) |
| MO | Molybdenum |
| MOA | Museum Of Art (Brigham Young University) |
| MOAB | Massive Ordnance Air Blast (official) - Mother Of All Bombs (slang) |
| MOB | Man Over Board - Marching Owl Band - Movable Object Block |
| MOC | Macedonian Orthodox Church - Measure Of Capability - Mission Operations Centre - My Own Creation (Lego) |
| MOCAS | Mechanization Of Contract Administration Services |
| MOD | Magneto-optical Disc - Masters Of Deception - Minimum Object Distance - Multiple Organ Dysfunction |
| MOD | Ministry Of Defence (United Kingdom) And Various Other Countries |
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