Forest Park is a village in Cook County, Illinois, United States, and a suburb of Chicago. The population was 14,339 at the 2020 census. The Forest Park terminal on the CTA Blue Line is the line's western terminus, located on the Eisenhower Expressway at Des Plaines Avenue. This makes it one of just two municipalities served by the Chicago "L" train network that does not directly border Chicago.

Forest Park is a station on the Chicago Transit Authority's 'L' system, located in the village of Forest Park, Illinois and serving the Blue Line. Before the Congress Line was built, it served as terminal for the Garfield Line. It is the western terminus of the Forest Park branch. The station was known as Des Plaines until 1994. It is also referred to as the Forest Park Transit Center by Pace because it is a major terminal for Pace buses. The station contains a 1,051-space Park and Ride lot which uses the "Pay and Display" system, in which fees are paid at the lot entrance. It is located south of the Baltimore and Ohio Chicago Terminal Railroad tracks which curve to the north of the station towards Madison Street where the line rechristens itself to the Canadian National Railway's Waukesha Subdivision.