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St. Monica Catholic High School is committed to becoming one of the top athletic programs in the Camino Del Rey Association and CIF's Southern Section. With 18 teams competing, Mariner student-athletes have the opportunity to enrich their academic experience and personal growth through athletic participation. St. Monica is proud to offer student-athletes the opportunity to compete in the following programs and leagues within the California Interscholastic Federation (CIF) Southern Section:

Fall: Boys Cross Country (Camino Real League), Cheer, Football (Santa Fe League), Girls Cross Country (Camino Real League), Girls Golf (Del Rey League), Girls Tennis (Del Rey League), Girls Volleyball (Camino Real League)

Winter: Boys Basketball (Santa Fel League), Boys Soccer (Camino Real League), Cheer, Girls Basketball (Camino Real League), Girls Soccer (Camino Real League)

Spring: Baseball (Santa Fe League), Boys Golf ( Del Rey/Camino Real League), Boys Tennis (Del Rey League), Boys Track & Field (Camino Real League), Boys Volleyball (Camino Real League), Girls Track & Field (Camino Real League), Softball (Camino Real League)