The Frank Lloyd Wright/Prairie School of Architecture Historic District is located in the village of Oak Park in Cook County, Illinois, United States.

The districts have differing boundaries and contributing properties, over 20 of which were designed by Frank Lloyd Wright, widely regarded as the greatest American architect.

The Frank Lloyd Wright–Prairie School of Architecture Historic District provides a look at a cross section of Wright's work which spans several decades over his career.

[4] Over 80 of the houses and buildings within the boundaries of the federal historic district were designed by Frank Lloyd Wright and other adherents to his early modern Prairie style architecture.

The National Register of Historic Places form called the district "undoubtedly the largest concentration of early modern architecture to be found anywhere in the world.