The 86th Street Line is a public transit line in Brooklyn, New York, running mostly along 86th Street. Originally a streetcar line, it is now the B1 86th Street bus route operated by the New York City Transit Authority.

Bay Ridge is a neighborhood in the southwest corner of the New York City borough of Brooklyn. It is bounded by Sunset Park to the north, Dyker Heights to the east, the Narrows and the Belt Parkway to the west, and Fort Hamilton Army Base and the Verrazzano-Narrows Bridge to the south. The section of Bay Ridge south of 86th Street is sometimes considered part of a sub-neighborhood called Fort Hamilton.