Oak Park is a village in Cook County, Illinois, United States. It is a near-western suburb of Chicago, easily accessible to downtown Chicago (the Chicago Loop) by public transportation. As of the 2000 census, the village had a total population of 52,524. A Census estimate for 2003 showed the population dipped to 50,824.

Oak Park is the birthplace of Carl Rogers, Derrick Fluegge, Ernest Hemingway, Edith Nash, and Betty White (from "The Golden Girls"). Frank Lloyd Wright's home was in Oak Park, and many buildings designed by him can be found throughout the town. Oak Park was also home of 19th century evangelical Christian and Zionist William Eugene Blackstone. Also hailing from Oak Park are Ray Kroc (founder of McDonald's corporation), actress Mary Elizabeth Mastrantonio, comedienne Kathy Griffin, actor Thomas Lennon, actor Johnny Galecki, Matthew and Eleanor Friedberger of the indie rock band The Fiery Furnaces, author Carol Shields, actor Bob Newhart, electronic musician Saskrotch, and the voice of Homer Simpson, Dan Castellaneta. Comic book artists Chris Ware and Gene Ha currently reside in Oak Park, as well as former "Frasier" star John Mahoney and punk rocker Ben Weasel. Notable former residents include Tarzan creator Edgar Rice Burroughs, chemist Percy Julian, poet Charles Simic, cryptographer Bruce Schneier, rapper Ludacris, astronomer Chad Trujillo, and filmmaker John Sturges.