The United States Capitol Complex is a group of about a dozen buildings and facilities in Washington, D.C. that are used by the United States government. The buildings and grounds within in the complex are managed and supervised by the Architect of the Capitol.

The United States Capital Complex is located at the eastern end of the National Mall.

United States Capitol Visitor Center was created in 2007.

United States Capitol Historical Society was created in 1962.

United States Capitol subway system was created in 1909.

United States Capitol Guide Service was created in 1876.