Plainfield South High School, or PSHS, is a four-year public high school located in Plainfield, Illinois, a southwest suburb of Chicago, Illinois, in the United States. It is part of the Plainfield Community Consolidated School District 202, which also includes three other high schools: Plainfield Central High School, Plainfield North High School and Plainfield East High School.The school's address, phone number, and school district belong to Plainfield, however, the school is within the Joliet city limits. Plainfield South won the 2022 3A Boys State Cross Country Championship.