Holy Cross High School was an all-boys, Roman Catholic high school in River Grove, Illinois, USA that operated from August 1961 until June 2004. In December, 2003, the school announced that they no longer had enough funding or interest in enrollment to continue. Only 79 students took the entrance exam for the 2004-2005 school year, and at least 125 were necessary to keep the school open. In June, 2004, the neighboring all-girls high school Mother Theodore Guerin High School accepted all Holy Cross students, becoming coed and changing their name to Guerin College Preparatory High School. Students from Mother Guerin and Holy Cross had already been sharing each other's facilities for certain classes, such as drama, music, and foreign languages.