| MCIA | Mactan-Cebu International Airport 
| Others |
| MCIA | Madera County Independent Academy
| Others |
| MCIA | Marine Corps Intelligence Activity
| Others |
| MCIA | Marine Corps Intelligence Association
| Others |
| MCIA | Massachusetts Commission on Indian Affairs
| Others |
| MCIA | Mauritius Cane Industry Authority
| Others |
| MCIA | McFarland Community Ice Arena
| Others |
| MCIA | Mclean County India Association
| Others |
| MCIA | Mercer County Improvement Authority
| Others |
| MCIA | Merged Clustering Imperialists Algorithm
| Others |
| MCIA | Mexico City International Airport
| Others |
| MCIA | Meyerland Community Improvement Association
| Others |
| MCIA | Michigan Cannabis Industry Association
| Others |
| MCIA | Micro Channel Interface Adapter
| Others |
| MCIA | Minnesota Crop Improvement Association
| Others |
| MCIA | Missing Children Investigation Agency
| Others |
| MCIA | Mississippi Crop Improvement Association
| Others |
| MCIA | Missouri Cannabis Industry Association
| Others |
| MCIA | Modern Completely Insane Anteaters
| Others |
| MCIA | Monmouth County Indian Association
| Others |
| MCIA | Montana Captive Insurance Association
| Others |
| MCIA | Morris County Improvement Authority
| Others |
| MCIA | Motion Control and Industrial Applications
| Others |
| MCIA | Multiple Co Inertia Analysis
| Others |
| MCIA | Multiport Controller Interface Adapter
| Others |
| MCIA | Municipal Conflict of Interest Act
| Others |
| MCIA | Municipal Construction Inspectors Association
| Others |