MTA

• Metropolitan Transportation Authority, the public transport agency in the metropolitan area of New York City, United States
• Metropolitan Transit Authority (disambiguation), which may refer to several public transport/transit agencies
• Flint Mass Transportation Authority, Genesee County, Michigan
• Maine Turnpike Authority, Maine
• Manchester Transit Authority, New Hampshire
• Maryland Transit Administration
• Massachusetts Bay Transportation Authority, formerly Metropolitan Transit Authority
• Massachusetts Turnpike Authority
• Mendocino Transit Authority, California
• Mountain Ash railway station, Wales, National Rail station code
• Nashville Metropolitan Transit Authority, doing business as WeGo Public Transit, Tennessee
• San Francisco Municipal Transportation Agency, California
• Los Angeles County Metropolitan Transportation Authority
• Mersin-Tarsus-Adana Railway, a defunct Ottoman railway company
• Master Top Airlines, a defunct Brazilian airline company

• Hungarian Academy of Sciences (Magyar Tudományos Akadémia), Budapest, Hungary
• Marsha Stern Talmudical Academy, an Orthodox Jewish private high school in New York, New York, US
• Mount Allison University, a university in Sackville, New Brunswick, Canada
• Musical Theatre Academy, a drama college based in London, UK

• Metrolina Theatre Association, an organization which advocates performing arts in Charlotte, North Carolina, US
• MTA Records, More Than Alot Records, a record label
• Muslim Television Ahmadiyya International, a satellite television network
• Move to Amend, a U.S. political advocacy organization that seeks to amend the Constitution
• Manufacturing Technologies Association, a UK trade association
• Market Technicians Association, a non-profit organization of technical analysts
• General Directorate of Mineral Research and Exploration (Turkey), known as MTA
• Michigan Townships Association, an association of US township governments
• Mong Tai Army, an armed rebel group
• Metro Transit Assassins, a graffiti collective

• Maccabi Tel Aviv, a sports club in Israel
• Maccabi Tel Aviv B.C., basketball team
• Maccabi Tel Aviv F.C., football (soccer) team
• Maximum time aloft, a sporting event with a boomerang

• methylthioadenosine, a cofactor in biochemistry
• 4-Methylthioamphetamine, a designer drug of the substituted amphetamine class developed in the 1990s
• Material transfer agreement, governing the transfer of research materials between two organizations
• Mineral trioxide aggregate, dental material, used in endodontics and vital pulp therapy
• MTA (Swedish: Mobiltelefonisystem A), a former manual mobile network in Sweden
• Medial temporal lobe type of brain atrophy.
• Mousterian of Acheulean tradition _(fr), a cultural and technological facies of the Mousterian

• Cray MTA-2, a supercomputer based on the design of the never-built Tera MTA
• Message transfer agent or mail transfer agent, software that transfers e-mail between computers
• Multi-touch attribution is a form of attribution (marketing)
• Multimedia terminal adapter, a combination cable modem and telephone adapter
• Multi-Threaded Apartment, a concept used in Microsoft's Component Object Model programming architecture
• Microsoft Technology Associate, a certification scheme run by Microsoft

• Multi Theft Auto, a mod for computer games in the PC game series Grand Theft Auto

• "M.T.A." (song), or "Charlie on the M.T.A.", a 1959 hit song by The Kingston Trio
• Major trading area, a geographic region of the US surrounding a major city; See List of Basic Trading Areas
• Mall Taman Anggrek, a shopping center in West Jakarta, Indonesia
• Mid-term adjustment, a change in an insurance policy
• Military Technical Agreement, treaty ending the Kosovo War in June 1999
• Milk Tea Alliance, an online democracy and human rights movement
• Farmall M-TA, a widely-used model in the Farmall M tractor series
• UAC/HAL Il-214 Multirole Transport Aircraft, a planned medium-lift military transport

• Metastasis-associated protein:
• MTA1
• MTA2
• MTA3

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