| Abbreviation | Definition |
|---|---|
| MAU | Mauritius |
| MC | Monaco |
| MD | Moldavia |
| MEAC | Middle East and Adjoining Countries |
| MECACAR | Middle East, CAucasus, and Central Asian Republics |
| MEDCS | More Economically Developed Countries these |
| MEFMA | Middle East Facility Management Association |
| MEX | Mexico |
| MG | Madagascar |
| MK | Macedonia |
| ML | Mali |
| MLY | Malaya |
| MM | Myanmar (Burma) |
| MN | Mongolia |
| MNE | Montenegro |
| MNL | Manila |
| MO | Macau |
| MON | Montenegro |
| MOR | Morocco |
| MP | Northern Mariana Islands |