The Chauncey Street station is a local station on the BMT Jamaica Line of the New York City Subway. Located at the intersection of Chauncey Street and Broadway in Brooklyn, it is served by the Z train during rush hours in the peak direction and by the J at all other times.

The BMT Jamaica Line, also known as the Broadway - Brooklyn Line, is an elevated rapid transit line of the B Division of the New York City Subway, in Brooklyn and Queens, New York City, United States. It runs from the Williamsburg Bridge southeast over Broadway to East New York, Brooklyn, and then east over Fulton Street and Jamaica Avenue to Jamaica, Queens. In western Jamaica, the line goes into a tunnel, becoming the lower level of the Archer Avenue lines in central Jamaica. The J and Z trains serve the entire length of the Jamaica Line, and the M serves the line west of Myrtle Avenue.