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.

Isaiah Rogers was an American architect from Massachusetts who eventually moved his practice south, where he was based in Louisville, Kentucky, and Cincinnati, Ohio. He completed numerous designs for hotels, courthouses and other major buildings in Boston, Massachusetts, and New York City, before that relocation.