Immaculate High School is a private, Roman Catholic high school in Danbury, Connecticut, United States. Overseen by the Diocese of Bridgeport, IHS serves residents of 23 towns in the greater Danbury area. Immaculate High School, established in 1962, enrolls 400 to 500 male and female students. In 2013, approximately 32% were Danbury residents, 5% residents of the nearest parts of New York, and the residue from Connecticut towns surrounding Danbury.