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Guerin Preparatory High School was a private, Roman Catholic high school in River Grove, Illinois, United States. It was located in the Roman Catholic Archdiocese of Chicago.
Guerin was established in 1962 as Mother Theodore Guerin High School, an all-girls school, by the Sisters of Providence of Saint Mary-of-the-Woods. The sisters named the school after their congregation's foundress, Saint Mother Theodore Guerin. The school was renamed when it became coeducational in 2004 and absorbed the students from the all-male Holy Cross High School after that school closed. Holy Cross High School had been opened in 1961.
Guerin closed permanently after the 2019–20 academic year due to declining enrollment, increased need in financial aid for students, and lower than expected fundraising results.