Established in 1982, Immaculate Conception Apostolic School (ICAS) was a private Roman Catholic boarding school for boys in grades seven through twelve. It was located within the Diocese of Manchester and sponsored by the Legionaries of Christ, a religious congregation of the Roman Catholic Church. The school buildings still stand overlooking Lake Winnipesaukee in the central New Hampshire town of Center Harbor. It served approximately 130 students at its heyday. It closed permanently in June 2015.