St. Stephen’s develops student athletes through recreational and competitive athletic opportunities. Through a variety of sport options each season, Spartans learn the values of discipline, sportsmanship, and teamwork. Varsity teams compete regionally in the Southwest Preparatory Conference
(SPC), and middle school athletes participate locally in the Austin Inter-Parochial League (AIPL). Spartan Soccer and Tennis Academies train and compete outside of the SPC. In addition to traditional sports, St. Stephen's offers outdoor recreation to students through the Devil's Canyon Wilderness Program (DCWP), which includes mountain biking, caving, and canoeing.