The Southwest Prairie Conference (SPC) is an organization of ten high schools in northern Illinois, representing five communities in that part of the state. These high schools are all members of the Illinois High School Association. The conference began competing during the 2006-2007 academic year. Minooka Community High School, Oswego High School, Oswego East High School, Plainfield Central High School, Plainfield East High School, Plainfield North High School, and Plainfield South High School came from the former Suburban Prairie Conference South division. Romeoville High School came from the former South Inter-Conference Association North division. Joliet Central and Joliet West high schools joined the conference from the Southwest Suburban Conference at the start of the 2016-2017 school year.