At Tanglin, the swimming programme is built on a pyramid system. The foundation lies in the curricular programme that students participate in as part of their PE lessons. At the next level are the Tanglin swimming clubs offering swim development and swim training. These run two evenings a week and are open to all students in the Junior and Senior Schools as part of our CCA programme. At the top of the pyramid are the sessions run by the external swim club "Southern Cross Dragons" which train swimmers to national and international competitive levels.

Swimming galas run throughout the year for Junior and Senior students. These include intra-school events such as house competitions, team galas and fun galas. Other meets include ACSIS and international school invitational galas within Singapore and international meets as part of the FOBISSEA sports competitions.