Chapel School students have the opportunity to participate in several interscholastic competitions.

Traditionally a member of the São Paulo High School League, which involves other English-speaking schools in the State of São Paulo, Chapel participates in Big 8, Big 4, and Little 8 tournaments. A variety of competitive sports are available to students: basketball (boys and girls), cheerleading (girls), indoor soccer / futsal (boys and girls), soccer (boys and girls), volleyball (boys and girls), and softball (boys and girls). All sports are offered on both Junior Varsity (under 15 years old) and Varsity (over 15 years old) levels.