The Borough Hall/Court Street station is an underground New York City Subway station complex in Brooklyn shared by the BMT Fourth Avenue Line, the IRT Broadway–Seventh Avenue Line and the IRT Eastern Parkway Line. The complex comprises three stations: Borough Hall on the IRT lines and Court Street on the BMT line. The stations are located under Court, Joralemon, and Montague Streets, next to Brooklyn Borough Hall, in the Downtown Brooklyn and Brooklyn Heights neighborhoods of Brooklyn. It is served by the 2, 4, and R trains at all times; the 3 train all times except late nights; the 5 train on weekdays; the N train during late nights; and limited rush-hour W trains.

The BMT Fourth Avenue Line is a rapid transit line of the New York City Subway, mainly running under Fourth Avenue in Brooklyn. The line is served by the D, N, and R at all times; the R typically runs local, while the D and N run express during the day and local at night. During rush hours, select W trains also serve the line. Northbound D and N trains run local along the line after 6:45 p.m. during weekdays as well. The line was originally built by the Brooklyn Rapid Transit Company and is now internally operated as part of the New York City Subway's B Division.