The Chicago race riot of 1919 was a violent racial conflict between white Americans and black Americans that began on the South Side of Chicago, Illinois, on July 27 and ended on August 3, 1919. During the riot, 38 people died. Over the week, injuries attributed to the episodic confrontations stood at 537, two-thirds black and one-third white; and between 1,000 and 2,000 residents, most of them black, lost their homes. Due to its sustained violence and widespread economic impact, it is considered the worst of the scores of riots and civil disturbances across the United States during the "Red Summer" of 1919, so named because of its racial and labor violence. It was also one of the worst riots in the history of Illinois.

Chicago is the most populous city in the U.S. state of Illinois and in the Midwestern United States. With a population of 2,746,388 in the 2020 census, it is the third-most populous city in the United States after New York City and Los Angeles. As the seat of Cook County, the second-most populous county in the U.S., Chicago is the center of the Chicago metropolitan area, often colloquially called "Chicagoland" and home to 9.6 million residents.