| Abbreviation | Definition |
|---|---|
| MCDA | Multnomah County District Attorney |
| MCDC | Madison County Drug Court |
| MCEB | Moot Court Executive Board |
| MCEE | Model Code of Ethics for Educators |
| MCEU | Medical Cannabis Enforcement Unit |
| MCF | Minnesota Correctional Facility |
| MCHB | Moot Court Honor Board |
| MCHB | Moot Court Honors Board |
| MCI | Maltreat Children is Illegal |
| MCI | Massachusetts Correctional Institute |
| MCI | Massachusetts Correctional Institution |
| MCIA | Missing Children Investigation Agency |
| MCIB | Marine Casualty Investigation Board |
| MCILS | Maine Commission on Indigent Legal Services |
| MCIU | Major Collision Investigation Unit |
| MCIU | Major Crash Investigation Unit |
| MCIU | Major Crime Investigation Unit |
| MCJ | M C J in Criminal Justice |
| MCJ | Mississippi Center for Justice |
| MCJC | Maricopa County Justice Courts |