The first classes at Notre Dame Catholic High School were held in 1956 in Our Lady of the Assumption School in…More Fairfield while Notre Dame's building was under construction on Park Avenue in Fairfield. In 1957, the new school was finished, and Notre Dame opened its doors to 1,000 freshmen and sophomores.
In 1964, Notre Dame's school and property became Sacred Heart University, one of two universities in Fairfield, and two new high schools had to be established - Notre Dame Boys in Fairfield and Notre Dame Girls in Bridgeport. The Sisters of Notre Dame de Namur continued to staff the girls' school, and the Holy Cross Fathers continued to staff the boys' school, with an increasing number of laity at each high school.
In 1973, the two schools were merged into what is the current Notre Dame Catholic High School on Jefferson Street in Fairfield. Notre Dame describes itself as a "co-educational diocesan Catholic high school that provides a college preparatory education to students from a wide area of Connecticut."
Students at Notre Dame Catholic High School come from 34 towns in Connecticut. The 2009-10 tuition was $10,680, and financial aid is available.