The Custom House and Old Post Office is a historic site located at 281 Front Street, Key West, Florida, United States. On September 20, 1973, it was added to the U.S. National Register of Historic Places.

The Custom House currently serves as the Key West Museum of Art & History, which is one of four museums operated by the Key West Art & Historical Society. Exhibits include local history, famous personalities including Ernest Hemingway, maritime history, and works by local artists.

The building was designed by architect William Kerr, and was completed in 1891. The United States District Court for the Southern District of Florida met here from its completion until 1932, when the building was transferred to the United States Navy.

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  Back view from Port of Key West
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  Museum in 2008 with American Gothic exhibit
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  From the ocean side
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  In 2017
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Part of a series on the
History of Key West
The Seal of Key West represents the Conch Republic in the island's culture
Landmarks African Cemetery at Higgs Beach USS Amesbury Key West Aquarium The Armory (Key West) Audubon House and Tropical Gardens Captain Tony's Saloon Key West Cemetery U.S. Coast Guard Headquarters, Key West Station Ernest Hemingway House Fogarty Mansion (Fogarty House) Eduardo H. Gato House Key West Heritage House Museum and Robert Frost Cottage Key West Historic District Key West Bight Key West Lighthouse Mallory Square Martello Gallery-Key West Art and Historical Museum U.S. Naval Station (Key West, Florida) Pan Am Dr. Joseph Y. Porter House Old Post Office and Customshouse (Key West, Florida) Sloppy Joe's Southernmost House Thompson Fish House, Turtle Cannery and Kraals Truman Annex Harry S. Truman Little White House Veterans of Foreign Wars Walter R. Mickens Post 6021 and William Weech American Legion Post 168 West Martello Tower Fort Zachary Taylor Notes that a majority of this list contains sites that have been added to the U.S. National Register of Historic Places or as a U.S. National Historic Landmark
People Conch (people) Henry Flagler John Geddes (politician) Ernest Hemingway Winslow Homer Indigenous people of the Everglades region José Martí Vicente Martinez Ybor Matthew C. Perry Mel Fisher Carl Tanzler Harry S. Truman
Topics Sinking of the Nuestra Señora de Atocha Key West Street Car Company The Great Fire of Key West (1886) Isaac Allerton (shipwreck) Overseas Railroad Overseas Highway Wrecking in the Florida Keys 1935 Labor Day hurricane Cubana de Aviación Flight 493 Key West Agreement Mariel boatlift Conch Republic Hurricane Wilma
Timeline Pre-history, until 1513 Spanish Rule, 1513–1763 British Rule, 1763–1783: American Revolutionary War, 1775–1783 Spanish Rule, 1783–1821: War of 1812, 1811–1814 U.S. Territorial Period, 1822–1845: Florida Wrecking Act, 1823 Federal Wrecking Act, 1825 Statehood, 1845–present: Fort Zachary Taylor, 1845 Ordinance of Secession, 1861 Civil War, 1861–1865 East Gulf Blockade Squadron, 1861 States
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• List of United States post offices

• Monroe County listings at National Register of Historic Places
• Florida's Office of Cultural and Historical Programs
  • Monroe County listings
  • Museum of Art and History at the Custom House
• Key West Museum of Art & History at the Custom House