| Abbreviation | Definition |
|---|---|
| MTIP | Metropolitan Transportation Improvements Program |
| MTIS | Multimodal Traveler Information Systems |
| MTL | Manual Transmission Lube |
| MTL | Manual Transmission Lubricant |
| MTLM | Master of Transportation and Logistics Management |
| MTM | medical transportation management |
| MTMCTEA | Military Traffic Management Command Transportation Engineering Agency |
| MTMCTTC | Military Traffic Management Command Transportation Terminal Command, Europe |
| MTN | Multilateral Trade Negotiations |
| MTOAF | Mass Transportation Operating Assistance Fund (New York) |
| MTP | Maryland Transportation Plan |
| MTP | Master Transportation Plan |
| MTP | Metropolitan Transportation Plan |
| MTP | Motor Transportation Payment |
| MTPA | Michigan Transportation Planning Association |
| MTPP | Toussaint L'Ouverture International Airport |
| MTPW | Maximum Technically Permissible Weight |
| MTQ | Ministère des Transports du Québec |
| MTQ | Ministry of Transport, Quebec |
| MTR | Major Transportation Route |