Lyons is a village in Cook County, Illinois, United States. Per the 2020 census, the population was 10,817. The Chicago Portage National Historic Site is located in Lyons.

Illinois's 3rd congressional district includes parts of Cook County and DuPage County, and has been represented by Democrat Delia Ramirez since January 3, 2023. The district was previously represented by Marie Newman from 2021 to 2023, Dan Lipinski from 2005 to 2021, and by Lipinski's father Bill from 1983 to 2005.