| Abbreviation | Definition |
|---|---|
| MCR | Model Court Room |
| MCSEP | Maryland Child Support Enforcement Program |
| MCSI | Magical Crime Scene Investigation |
| MCU | Major Crime Unit |
| MD | Majorly Demented |
| MD | Malignant Denial |
| MD | Mandatory Disclosure |
| MD | Marque Deposee |
| MD | Mentally Deranged |
| MD | Morally Deficient |
| MD | More Dope |
| MD | Mucho Dough |
| MDC | Metropolitan Detention Center |
| MDC | Most Dangerous Corner |
| MDD | Montana Dangerous Drug |
| MDEA | Maine Drug Enforcement Agency |
| MDI | Medicolegal Death Investigation |
| MDIL | MA in Diplomacy and International Law |
| MDIL | Metro Detroit Injury Law |
| MDL | Multi District Litigation |