Saint-Charles is a private bilingual day and boarding school in Porrentruy, in the canton of Jura, teaching since 1897. Around 150 students attend, from the fifth Harmos primary year through to university entrance. It offers the four-year gymnasium leading to the Swiss maturité, alongside a bilingual French-English maturité. Its international section is an IB World School, authorised for the Diploma Programme in 2020 and the Middle Years Programme in 2022, and taught in English. The co-educational boarding house takes several dozen students; day pupils are accepted from age eight and boarders from age ten.