Boylan Central Catholic High School is a private Catholic high school located in Rockford, Illinois, United States. Founded in 1960, Boylan is the only Catholic high school in the city. At the start of the 2010–2011 school year, there were 1187 students enrolled. Enrollment numbers have decreased in the subsequent years. According to the school's website, in 2015–2016, the total number of students was only 956. It is located in and administered by the Roman Catholic Diocese of Rockford.