Hyde Park Township is a former civil township in Cook County, Illinois, United States that existed as a separate municipality from 1861 until 1889 when it was annexed into the city of Chicago. Its borders are Pershing Road on the north, State Street on the west, Lake Michigan and the Indiana state line on the east, and 138th Street and the Calumet River on the south. This region comprised much of what is now known as the South Side of Chicago.

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.