The International Schools Sports Tournament (ISST) reached its 50th anniversary year in 2018-19. It is an organization that has serviced a number of international students across Europe over the years. It is considered by many as a pioneer organization in International School sports competition.

The ISST is an athletic organization
which governs competitive athletic championships for its 8 member schools at the middle school, junior varsity and varsity levels. The ISST currently sanctions eleven sports for 32 championships annually.