St. Mark School proudly participates in the Diocese of Bridgeport’s Saint Sebastian Catholic Youth Organization (CYO), a highly regarded sports program that offers student-athletes the opportunity to develop both their athletic skills and personal character. This centralized organization is committed to providing a formative and enriching experience, emphasizing teamwork, discipline, and sportsmanship.

Through the St. Sebastian CYO, students at St. Mark School can engage in a variety of athletic activities, including cross country, basketball, and track. These programs not only encourage physical fitness and healthy competition but also align with the values of Catholic education, fostering personal growth and a sense of community among participants. The St. Sebastian CYO serves as an excellent platform for students to explore their athletic potential while building lifelong skills and friendships.