The International School of Brussels (ISB) is an English-language international school that provides an international education to over 1400 students aged 3 to 18 from over 70 countries. Its 40-acre (16 ha) campus lies in the Brusselscommune of Watermael-Boitsfort, about 9 kilometres (5.6 mi) southeast of the city centre.

All of the buildings use new ‘green’ technologies, and trees planted by Middle School students dot the grounds. Surrounding the school is a forest, with entries to the Brussels region’s forest trails across the campus.

An outdoor track, performing arts center, two gymnasiums, and 15 hectares (37 acres) of playing fields and woods are located on the campus.

The 19th century building called the “Château” is the school’s administration building. Designed with pillars, the building houses a reception area that hosts parents of students. The remaining buildings, which include the Early Childhood Centre (ECC), the Elementary School (ES), the Middle School (MS) and the High School (HS), the Annex, the theatre, the International Community Centre (ICC) and the gymnasiums are scattered throughout the campus, which also has extensive sports fields, covered play areas, a climbing wall, a running track, a fitness centre, and a tennis bubble.