| Abbreviation | Definition |
|---|---|
| MI | Midway Island |
| MI | Mile |
| MI | Military Industry |
| MI | Military Intelligence |
| MI | Mobile Infantry |
| MI | Mounted Infantry |
| MI | Movement Instructions |
| MI | Mustered In |
| MI2 | British Military Intelligence Section 2 |
| MI6 | British Intelligence Service |
| MIA | Missing In Action |
| MIAC | Maritime Intelligence and Analysis Center |
| MIAD | Military Intelligence Augmentation Detachment |
| MIAP | Missing in America Project |
| MIB | Management Information Base |
| MIB | Military Intelligence Battalion |
| MIB | Military Intelligence Board |
| MIB | Mishap Investigation Board |
| MIB | Mobile Infantry Brigade |
| MIB | Mutual Intelligence Board |