The International School of Lausanne (ISL) is a luxury English-language private school located in the village of Le Mont-sur-Lausanne, just north of Lausanne, Switzerland.

[citation needed] The South Campus, designed by Hannes Ehrensperger of CCHE Architecture et Design SA, doubled the total area of ISL and includes an auditorium with 400 seats.

[1] The school offers the complete IB program (PYP, MYP and IBDP) from Reception 3 to Year 13.

ISL's (upper) secondary education (Middle and High School) is not approved as a Mittelschule/Collège/Liceo by the Swiss Federal State Secretariat for Education, Research and Innovation (SERI).

The International School of Lausanne has followed the IB system since September 2000.