MTA
- 4-Methylthioamphetamine
- Cray MTA-2
- Farmall M
- Flint Mass Transportation Authority
- General Directorate of Mineral Research and Exploration (Turkey)
- Hungarian Academy of Sciences
- List of Basic Trading Areas
- Los Angeles County Metropolitan Transportation Authority
- M.T.A. (song)
- MTA Records
- MTA1
- MTA2
- MTA3
- MTD (mobile network)
- Maccabi Tel Aviv
- Maccabi Tel Aviv B.C.
- Maccabi Tel Aviv F.C.
- Maine Turnpike Authority
- Mall Taman Anggrek
- Manchester Transit Authority
- Manufacturing Technologies Association
- Market Technicians Association
- Marsha Stern Talmudical Academy
- Maryland Transit Administration
- Massachusetts Bay Transportation Authority
- Massachusetts Turnpike Authority
- Master Top Airlines
- Material transfer agreement
- Maximum time aloft
- Mendocino Transit Authority
- Mersin-Tarsus-Adana Railway
- Message transfer agent
- Metro Transit Assassins
- Metrolina Theatre Association
- Metropolitan Transit Authority (disambiguation)
- Metropolitan Transportation Authority
- Michigan Townships Association
- Microsoft Technology Associate
- Mid-term adjustment
- Military Technical Agreement
- Milk Tea Alliance
- Mineral trioxide aggregate
- Mong Tai Army
- Mount Allison University
- Mountain Ash railway station
- Mousterian
- Move to Amend
- Multi Theft Auto
- Multi-Threaded Apartment
- Multimedia terminal adapter
- Musical Theatre Academy
- Muslim Television Ahmadiyya International
- San Francisco Municipal Transportation Agency
- UAC/HAL Il-214
- WeGo Public Transit