Oulu International School (OIS) is a public, not-for-profit, co-educational international school in the Myllytulli district in Oulu, Finland. The school was founded in 2001. It is one of nine English-speaking schools in Finland that offer basic education. The school is part of the International Baccalaureate (IB) network. It offers the IB and in English, but the IB Diploma Programme is offered by Oulun Lyseon Lukio.