Usonia is a word that was used by the American architect Frank Lloyd Wright to refer to the United States in general, and more specifically to his vision for the landscape of the country, including the planning of cities and the architecture of buildings. Wright proposed the use of the adjective Usonian to describe the particular New World character of the American landscape as distinct and free of previous architectural conventions.

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".