| Acronym | Meaning |
| MI | Middle Initial |
| MI | Machine Intelligence |
| MI | Maintenance Item |
| MI | Management Indicator |
| MI | Management Information |
| MI | Manpower Information |
| MI | Marine Inspection (US Coast Guard) |
| MI | Marine Instructor |
| MI | Maritime Interdiction |
| MI | Master Instructor |
| MI | Master Interface (US Army) |
| MI | Material Inspection |
| MI | Mechanical Inspection |
| MI | Medical Investigator |
| MI | Medically Indigent |
| MI | Mil' (Soviet helicopter designer) |
| MI | Military Intelligence |
| MI | Minister of Information |
| MI | Miscellaneous (work) Item |
| MI | Misiones (Argentina province, airline code) |
| MI | Missed Intercept (combat aviation) |
| MI | Missile Item |
| MI | Mobile Infantry (Starship Troopers) |
| MI | Mobility Impairment |
| MI | Model Integration |
| MI | Modification Instruction |
| MI | Movement Instructions (US DoD) |
| MI | Multi-Installation |