The Chicago Blues Festival is an annual event held in June, that features three days of performances by top-tier blues musicians, both old favorites and the up-and-coming. It is hosted by the City of Chicago Department of Cultural Affairs and Special Events, and always occurs in early June. Until 2017, the event always took place at and around Petrillo Music Shell in Grant Park, adjacent to the Lake Michigan waterfront east of the Loop in Chicago. In 2017, the festival was moved to the nearby Millennium Park.

The Petrillo Music Shell is an outdoor amphitheater in Grant Park in the Loop community area of Chicago in Cook County, Illinois, United States. It serves as host to many large annual music festivals in the city such as Chicago Blues Festival, Chicago Jazz Festival, Taste of Chicago and Lollapalooza.