The Atlantic Branch is an electrified rail line owned and operated by the Long Island Rail Road in the U.S. state of New York. It is the only LIRR line with revenue passenger service in the borough of Brooklyn.

The Atlantic Terminal is the westernmost commuter rail terminal on the Long Island Rail Road's (LIRR) Atlantic Branch, located at Flatbush Avenue and Atlantic Avenue in Downtown Brooklyn, New York City. It is the primary terminal for the West Hempstead Branch, and a peak-hour terminal for some trains on the Hempstead Branch, Far Rockaway Branch, and the Babylon Branch; most other service is provided by frequent shuttles to Jamaica station. The terminal is located in the City Terminal Zone, the LIRR's Zone 1, and thus part of the CityTicket program.