With 560 students from over 43 countries, ISB is one of the few schools in New England offering the International Baccalaureate.

The International School of Boston was founded in 1962 as the Jardin d’Enfants (literally Children's Garden, French for “Kindergarten”), by Marie-Madeleine Berry (1930-2024), in hopes of integrating French language and culture into children's educational experiences.

Since 1962 ISB has grown from 15 children to 560, and expanded to serve TPS through 12th grade.

The school had a nomadic existence in its early years as it searched for suitable space.

Its main building is the former Cambridge Almshouse, built in 1850 and listed on the National Register of Historic Places.