| Abbreviation | Definition |
|---|---|
| ML | Mailing List |
| MLN | My Lego Network |
| MMA | Medieval Marching Association |
| MMA | Mixed Martial Arts |
| MMFT | Mad Man's Free Time |
| MMHF | Makin Money Havin Fun |
| MMM | Make More Money |
| MMMS | Michigan Military Modelling Society |
| MMMSC | Maine Missile Math and Science Club |
| MMOG | Massive Multi-player On-line Game |
| MMORPG | Massive Multiplayer On-line Role Playing Game |
| MMRWRPG | Massive Multiplayer Real World Role Playing Game |
| MNH | Mint Never Hinged |
| MOA | Motorcycle Owners of America |
| MOAC | Maine Outdoor Adventure Club |
| MOAC | Montreal Outdoors Adventure Club |
| MOB | Motivated Over Bicycling |
| MOC | Mint On Card |
| MOC | Mustang Owners Club |
| MOC | My Own Creation |