Oeiras International School

Oeiras International School (OIS) is a distinguished co-educational day school located in Barcarena, within the municipality of Oeiras, to the west of Lisbon. OIS is particularly notable as the only school in Portugal that offers all three International Baccalaureate programmes — the Primary Years Programme, the Middle Years Programme, and the Diploma Programme — providing students with a seamlessly integrated IB education from age 3 through to 18. This full IB pathway ensures exceptional consistency and depth of learning throughout students' entire school career. Oeiras International School is situated on a beautiful quinta (country estate) that blends historical charm with modern academic facilities, providing a unique and enriching learning environment. The school's experienced international teaching staff, small class sizes, and personalised approach to learning ensure that every student receives the support and challenge they need to achieve their full potential. The school's commitment to academic rigour, multilingual education, and the development of globally minded, compassionate individuals makes it a standout choice for internationally minded families in the Lisbon and Oeiras area.