A custom house or customs house was traditionally a building housing the offices for a jurisdictional government whose officials oversaw the functions associated with importing and exporting goods into and out of a country, such as collecting customs duty on imported goods. A custom house was typically located in a seaport or in a city on a major river, with access to an ocean. These cities acted as ports of entry into a country.

The Alexander Hamilton U.S. Custom House is a government building, museum, and former custom house at 1 Bowling Green, near the southern end of Manhattan in New York City, New York, United States. Designed by Cass Gilbert in the Beaux-Arts style, it was erected from 1902 to 1907 by the government of the United States as a headquarters for the Port of New York's duty collection operations. The building contains the George Gustav Heye Center museum, the United States Bankruptcy Court for the Southern District of New York, and the New York regional offices of the National Archives. 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.