| Abbreviation | Definition |
|---|---|
| MTR | Mass Transit Railway |
| MTR | Mileage Transportation Reimbursement |
| MTR | Military Training Route |
| MTR | Motor Technical Reference |
| MTRB | Michigan Transportation Research Board |
| MTRC | Mass Transit Railway Corporation |
| MTRCL | Mass Transit Railway Corporation Limited |
| MTRN | Midnight Trucking Radio Network |
| MTS | Marine Transportation System |
| MTS | Martin Transportation Systems |
| MTS | Mobil-Trac System |
| MTSA | Major Transit Station Area |
| MTSA | Maritime Transportation Security Act |
| MTSAT | Multifunctional Transport Satellite |
| MTSC | Maine Transportation Safety Coalition |
| MTSS | Monitor Transport Strapping System |
| MTT | Multi Troop Transportation |
| MTTA | Myanmar Tourism Transportation Association |
| MTTM | Modes of Transport and Traffic Management |
| MTTR | Minimal Tariff Table Rate |