The SIS Swiss International Schools are a group of 19 private day schools in Switzerland, Germany, Brazil and Italy offering continuous education from kindergarten through to college. As of 2024, more than 5,000 students are enrolled with the SIS.
SIS has been operating schools in Switzerland since 1999, in Germany since 2008, and in Brazil since 2011. It is a joint venture of Kalaidos Education Group (Switzerland) and Klett Group (Germany).