Blair House is a guest house for state visitors to Washington, D.C. (in the United States of America). During much of the presidency of Harry Truman, it acted as the residence of the President of the United States, while the interior of the White House, which had been found to have serious structural faults, was completely gutted and rebuilt.

On November 1, 1950 Puerto Rican nationalists Griselio Torresola and Oscar Collazo attempted to assassinate Truman in the Blair House.