Coordinates: 40°42′15.7″N 73°58′28″W / 40.704361°N 73.97444°W
Wallabout Bay is small body of water in Upper New York Bay along the northwest shore of the New York City borough of Brooklyn, between the present Williamsburg and Manhattan bridges, opposite Corlear's Hook on Manhattan to the west, across the East River. Wallabout Bay is now the site of the Brooklyn Navy Yard.
The nearby neighborhood of Wallabout, dating back to the 17th century, is adjacent to the bay. The neighborhood is a mixed use area with an array of old wood frame buildings, public housing, brick townhouses, and warehouses; it is bounded by Navy Street to the west, the Brooklyn Navy Yard to the north, Myrtle Avenue to the south, and Classon Avenue to the east, and contains the historic Lefferts-Laidlaw House, which was added to the National Register of Historic Places in 1985.
The name of this curved bay on the western end of "Lang Eylandt" (Long Island) comes from the Dutch "Waal bocht", which means "Walloons' Bend", named for its first European settlers: the Walloons, from what is today Wallonia.