Fallingwater is a house designed by the architect Frank Lloyd Wright in 1935. Situated in the Mill Run section of Stewart township, in the Laurel Highlands of southwest Pennsylvania, about 70 miles (110 km) southeast of Pittsburgh in the United States, it is built partly over a waterfall on the Bear Run river. The house was designed to serve as a weekend retreat for Liliane and Edgar J. Kaufmann, the owner of Pittsburgh's Kaufmann's Department Store.

Frank Lloyd Wright Sr. was an American architect, designer, writer, and educator. He designed more than 1,000 structures over a creative period of 70 years. Wright played a key role in the architectural movements of the twentieth century, influencing architects worldwide through his works and mentoring hundreds of apprentices in his Taliesin Fellowship. Wright believed in designing in harmony with humanity and the environment, a philosophy he called organic architecture. This philosophy was exemplified in Fallingwater (1935), which has been called "the best all-time work of American architecture".