The Fulton Street Line, also called the Fulton Street Elevated or Kings County Line, was an elevated rail line mostly in Brooklyn, New York City, United States. It ran above Fulton Street from Fulton Ferry, Brooklyn, in Downtown Brooklyn east to East New York, and then south on Van Sinderen Avenue (southbound) and Snediker Avenue (northbound), east on Pitkin Avenue, north on Euclid Avenue, and east on Liberty Avenue to Ozone Park, Queens.
The portion in Brooklyn has been torn down, but most of the line in Queens has been connected to the New York City Subway and is now part of the IND Fulton Street Line (served by the A). The section of the IND Fulton Street Line in Brooklyn is an underground line, replacing the elevated line. The structure was the main line of the Kings County Elevated Railway, which first opened in 1888.