| Abbreviation | Definition |
|---|---|
| MSV | Merchant Space Vehicle |
| MSV | Multifunction Service Vehicle |
| MSVA | Motorcycle Single Vehicle Approval |
| MSVOL | Motorized Snow-Vehicle Operator’s Licence |
| MSVOL | Motorized Snow-Vehicle Operators Licence |
| MSVS | Medium Support Vehicle System |
| MSW | Maximum Shipping Weight |
| MSY | New Orleans International Airport / Moisant Field |
| MT | Manitoba Trunk |
| MT | Marine Terminal |
| MT | Marker Type |
| MT | Maximum Traction |
| MTA | Maryland Transport Authority |
| MTA | Mass Transit Authority |
| MTA | Mass Transportation Authority |
| MTA | Metropolitan Transit Authority |
| MTA | Metropolitan Transportation Authority |
| MTA | Municipal Transportation Agency |
| MTAPD | Metropolitan Transportation Authority Police Department (NYC) |
| MTAS | Mars Transportation Assessment Study |