Main Interior Building

US Department of the Interior Building
U.S. National Register of Historic Places
Main Interior Building viewed from the south. The José Artigas statue is in the foreground.
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Location	Eighteenth and C Sts. NW, Washington, District of Columbia
Coordinates	38°53′38″N 77°2′33″W / 38.89389°N 77.04250°W / 38.89389; -77.04250Coordinates: 38°53′38″N 77°2′33″W / 38.89389°N 77.04250°W / 38.89389; -77.04250
Area	5 acres (2.0 ha)
Built	1936
Architect	Wood, Waddy Butler; Et al.
NRHP Reference #	86002898
Added to NRHP	November 10, 1986

The Main Interior Building, also known as the Stewart Lee Udall Department of the Interior Building, located in Washington, D.C., is the headquarters of the United States Department of the Interior.

Located in the Foggy Bottom neighborhood, it is bounded by 19th Street NW on the west, 18th Street NW on the east, E Street NW on the north, C Street NW on the south, and Virginia Avenue on the southwest. Although the building takes up the entire block, the address is "1849 C Street, NW" to commemorate the founding of the Department of Interior in 1849. To the east is DAR Constitution Hall, the headquarters of the Daughters of the American Revolution, as well as the World Resources Institute and the American Red Cross National Headquarters. To the west is the Office of Personnel Management headquarters. To the north is Rawlins Park, which includes at its eastern end a statue of Major General John A. Rawlins. To the south is Triangle Park.

The Building includes offices of the Secretary of the Interior and Department employees. It also includes the Interior Museum and Interior Library.

From 1852 to 1917, the Interior Department was headquartered in the Patent Office building, which today houses the National Portrait Gallery and the Smithsonian American Art Museum of the Smithsonian Institution. From 1917 until the completion of the Main Interior Building, the Interior Department was housed in what is now the U.S. General Services Administration Building, between E and F Streets and 18th and 19th Streets NW.