The 20th-Century Architecture of Frank Lloyd Wright is a UNESCO World Heritage Site consisting of a selection of eight buildings across the United States that were designed by American architect Frank Lloyd Wright. These sites demonstrate his philosophy of organic architecture, designing structures that were in harmony with humanity and its environment. Wright's work had an international influence on the development of architecture in the 20th century.

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".