Stamford is proud to be a member of the Athletic Conference of Singapore International Schools (ACSIS) and fields teams in this international school league for the following ages: U8, U9, U10, U11, U12, 13, U14, U16 and U19.

Seasonal ACSIS sport teams include: Football, Basketball, Tennis, Cross Country, Badminton, Golf, Rugby, Touch Rugby, Volleyball, Swimming, Gymnastics, Softball, Netball and Track.

The mission of ACSIS is to provide student-athletes with an opportunity to compete in a broad and balance inter-school athletic program that is integral to their educational experience. Win of lose, the ACSIS schools will encourage student-athletes to exhibit a positive effort, display sportsmanship, and demonstrate respect. There are over 30 Singapore-based International schools in ACSIS.