| Abbreviation | Definition |
|---|---|
| MPTC | Maryland Police Training Commission |
| MPTC | Municipal Police Training Committee |
| MPVA | Miami Police Veterans Association |
| MRCC | Maritime Rescue Co-ordination Centre |
| MRPD | Mount Rainier Police Department |
| MRSC | Marine Rescue Sub-Centre |
| MRT | Mountain Rescue Team |
| MS | Man Stuck |
| MSF | Most Similar Force |
| MSFS | Master of Science Forensic Science |
| MSHP | Missouri State Highway Patrol |
| MSP | Malabar Special Police |
| MSP | Maryland State Police |
| MSP | Michigan State Police |
| MSST | Maritime Safety and Security Team |
| MSSTF | Manhattan South Scooter Task Force |
| MSTF | Manhattan South Task Force |
| MSU | Medium Security Unit |
| MTA | Multi-Theft Auto |
| MTD | Motor Transport Division |