| Abbreviation | Definition |
|---|---|
| MRTA | Marketable Record Title Act |
| MS | Man Stuck |
| MS | Midnight Special |
| MS | Most Specific |
| MS | Mystery Solved |
| MSA | Marital Settlement Agreement |
| MSA | Master Settlement Agreement |
| MSBA | Maine State Bar Association |
| MSBA | Maryland State Bar Association |
| MSBA | Michigan State Bar Association |
| MSBA | Minnesota State Bar Association |
| MSC | Mandatory Settlement Conference |
| MSG | Mink Shoals Gang |
| MSJ | Motion for Summary Judgement |
| MSM | Murder, Suicide, and Mahem |
| MSO | Multiple Separate Offenses |
| MSP | Missouri State Penitentiary |
| MSPCL | Michigan State Police Crime Laboratory |
| MSR | Municipal Sewage Regulation |
| MSTH | McNeely, Stephenson, Thopy, and Harrold law firm |