The Metro-North Commuter Railroad Company, or MTA Metro-North Railroad, or, more commonly, Metro-North, is a suburban commuter rail service that is run and managed by the Metropolitan Transportation Authority (MTA), an authority of New York State. Metro-North runs service between New York City to its northern suburbs in New York and Connecticut, as well as to other regions, including, in conjunction with New Jersey Transit, to parts of New Jersey as well. Trains terminate in places respective to their branch line; these locals include, in New York State, in Port Jervis, Spring Valley, Poughkeepsie, and Wassaic; in Connecticut, in New Canaan, Danbury, Waterbury, and New Haven. Metro-North also provides local rail service within New York City with a steeply reduced fare.

The MTA, which also operates the New York City Transit Authority buses and subways, as well as the Long Island Rail Road, also has jurisdiction, through Metro-North, for use of the railroad lines on the western and eastern portion of the Hudson River in New York State. Service on the western side of the Hudson, within New Jersey, is actually operated by New Jersey Transit under contract with the MTA. North of the New Jersey state line, the western portion of the Hudson is part of New York State, and is also under the jurisdiction of Metro-North.

In addition, the MTA had announced in October 2002 that it had plans to merge Metro-North with the Long Island Rail Road, which serves all of Long Island, including parts of Brooklyn and Queens; into a new entity, to be called MTA Rail Road . This merger, however, will require approval by the New York State legislature, which, as of April 2006, has failed to happen. The proposal was resubmitted to the state legislature in January 2007.