Participation in co-curricular activities is a privilege granted to all NCS students. Students are encouraged to be active in a variety of activities, which are an important element of their growth and development during their school years.

NCS offers a variety of co-curricular activities at the middle and high school levels. The activities provide opportunities for a range of interests, from raising school spirit in Pep Club, Positive Peers, and Newman Ambassadors to service in Key Club, Conservation Club, and Campus Ministry to academic pursuits and competitions in Math League, Battle of the Books, Brains Team, Geography Club, Ocean Sciences Bowl, and the Envirothon Team. The middle and high schools also support Student Councils to act as the liason between the students and administration as well as organize a variety of activities for the students.