The Atlantic Avenue–Barclays Center station is a New York City Subway station complex shared by the BMT Fourth Avenue Line, the BMT Brighton Line and the IRT Eastern Parkway Line. Named after Atlantic Avenue and the Barclays Center arena, it is located at Fourth and Flatbush Avenues' intersections with Atlantic Avenue and Pacific Street in Downtown Brooklyn. The complex is served by the 2, 4, D, N, Q and R trains at all times; the 3 train at all times except late nights; the 5 and B trains on weekdays during the day; and a few 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.