Mariners Harbor is a neighborhood located in the northwestern part of New York City's borough of Staten Island. It is bordered by Lake Avenue to the east, Forest Avenue to the south, Richmond Terrace to the north, and Holland Avenue to the west. The northwestern section of Mariners Harbor is often known as Arlington.

Mariners' Harbor is a station on the abandoned North Shore Branch of the Staten Island Railway. It had two tracks and one island platform. It is located in an open cut in the Staten Island neighborhood of Mariners Harbor at Van Pelt Avenue, about 4.6 miles (7.4 km) from the Saint George terminal.