The New York City Subway is a rapid transit system owned by the City of New York and leased to the New York City Transit Authority, a subsidiary agency of the Metropolitan Transportation Authority and also known as MTA New York City Transit. It is one of the oldest and most extensive public transportation systems in the world, with 468 stations in operation (422 if stations connected by transfers are counted as a single station); 229 miles (369 km) of routes, translating into 656 miles (1,056 km) of revenue track; and a total of 842 miles (1,355 km) including non-revenue trackage. In 2007, the subway delivered over 1.562 billion rides, averaging over five million on weekdays, 2.9 million on Saturdays, and 2.2 million on Sundays.

The New York City Subway trails only the metro systems of Tokyo, Moscow and Seoul in annual ridership and carries more passengers than all other rail mass transit systems in the United States combined. Among the world's busiest metro systems it is the only one to run 24 hours a day, 365 days a year. Subway stations are located throughout Manhattan, Brooklyn, Queens, and the Bronx.

All services pass through Manhattan, except for the Franklin Avenue Shuttle, the Rockaway Park Shuttle and the Brooklyn–Queens Crosstown Local (G) which connects Brooklyn and Queens directly without entering Manhattan. All but two of the 468 stations of the subway are served 24 hours a day. This is very rare globally and only found in the United States with PATH (connecting New Jersey with Manhattan), the PATCO Speedline (linking Philadelphia with southern New Jersey), and two lines of the Chicago 'L'.

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