| Rank | Abbreviation | Meaning |
|---|
| ***** | MCI | Mass Casualty Incident
| |
| ***** | MCI | Meal, Combat, Individual
| |
| **** | MCI | Mobile Company of Iran
| |
| *** | MCI | Multimedia Command Interface
| |
| ** | MCI | Ministerio de Ciencia e Innovacion
| |
| ** | MCI | Mission Capability Inspection
| |
| * | MCI | Marine Corps Institute
| |
| * | MCI | movimento combattentistico italiano
| |
| * | MCI | Multi-Command Instruction
| |
| * | MCI | Multiport Communications Interface
| |
| * | MCI | Mission Capability Index
| |
| * | MCI | Managing Criminal Investigations
| |
| * | MCI | Mission Compatability Index
| |
| * | MCI | Modern Comptrollership Initiative
| |
| * | MCI | Managed Cost Improvement
| |
| * | MCI | Marine Casualty Investigation
| |
| * | MCI | Multi-Chip Integration
| |
| * | MCI | Military Customs Inspection / Inspector
| |
| * | MCI | Military Customs Inspection
| |
| * | MCI | Multi Casualty Incident
| |
| * | MCI | Major Currencies Index
| |
| * | MCI | Marine Corps Installations
| |