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.

Fulton Street is a long east–west street in northern Brooklyn, New York City. This street begins at the intersection of Adams Street and Joralemon Street in Brooklyn Heights, and runs eastward to East New York and Cypress Hills. At the border with Queens, Fulton Street becomes 91st Avenue, which ends at 84th Street in Woodhaven.