The International School of Milan (ISM) is an international school and IB World School in the northern part of Milan, Italy. The school was the first fully authorised institution in Italy to offer all three of the programmes of the International Baccalaureate: Primary Years Programme, Middle Years Programme and Diploma Programme, for students aged 2 to 19.

The International School of Milan is the largest and oldest school in a group of International Schools in Italy run by the Inspired Group: the others are Monza, Modena, Siena and Bergamo although there are many other schools within the organization's global network. It has a partner school in Aliso Veijo, California, and supports educational projects in India, Zambia, Cambodia, Ethiopia as well as local projects. In addition, the school is part of a range of international school organizations and networks. The school is the largest and oldest international curriculum school in Milan and sends graduates to universities in the UK, US, Italy and all over the world. The current Headmaster of the school is Stephen Rogers who joined from the English International School, Prague in 2017.