The Metropolitan Transportation Authority[1]​ (MTA, for its acronym in English Metropolitan Transportation Authority) is the public-charitable corporation responsible for public transportation in the New York City region.

It was created by the Legislature of the State of New York "New York (state)"), in 1965, with the name of Metropolitan Commuter Transportation Authority. In 1968, with the incorporation of the New York City Transit Authority (responsible for the Subway and bus system in New York City) within its network of affiliated systems, it changed its name to the current Metropolitan Transportation Authority (MTA).

The area covered by the Authority includes the city's five boroughs, plus Nassau "Nassau County (New York)") and Suffolk "Suffolk County (New York)") on neighboring Long Island, and Westchester, Dutchess, Orange "Orange County (New York)"), Rockland and Putnam "Putnam County (New York)") north of the city. All of them make up the so-called "Regional Transportation District" (MTA Commuter Transportation District).

Currently the Metropolitan Transportation Authority is made up of the agencies listed below. The legal names (used in legal texts) and popular names are cited, which the MTA implemented in the 1990s in order to more clearly identify the different agencies with the MTA.

These agencies and their tasks are: