55 Wall Street, formerly the National City Bank Building, is an eight-story building on Wall Street between William and Hanover streets in the Financial District of Lower Manhattan in New York City, New York, United States. The lowest three stories were completed in either 1841 or 1842 as the four-story Merchants' Exchange and designed by Isaiah Rogers in the Greek Revival style. Between 1907 and 1910, McKim, Mead & White removed the original fourth story and added five floors to create the present building. The facade and part of the interior are New York City designated landmarks, and the building is listed on both the New York State Register of Historic Places and the National Register of Historic Places (NRHP) as a National Historic Landmark. It is also a contributing property to the Wall Street Historic District, listed on the NRHP.

The Financial District of Lower Manhattan, also known as FiDi, is a neighborhood located on the southern tip of Manhattan in New York City. It is bounded by the West Side Highway on the west, Chambers Street and City Hall Park on the north, Brooklyn Bridge on the northeast, the East River to the southeast, and South Ferry and the Battery on the south.