ISB has a swimming programme that consists of a Senior Team (Grade 7-12) and a Junior Team (Grade 3-6). Both of these teams practice off campus at the nearby VUB pool. The Senior Team practices four days a week in the mornings. Swimmers are dropped off by parents and brought to school by bus. The Junior Team practises two mornings and one afternoon per week with parents picking the swimmers up at the pool following afternoon training. Both teams compete in a series of meets hosted at international schools around Europe. The Senior Team then competes in the Varsity ISST Championship Meet and the Junior Team participates in the Belgium Junior Championships.