Oeiras International School
International School in Lisbon
Quick answer
Oeiras International School Lisbon (registry duplicate) is the same OIS, serving 460 students from 50 nationalities aged 5 to 18 across a 5-hectare Greater Lisbon campus. The school delivers the full IB Continuum, accredited by IBO, CIS, NEASC and ECIS — a four-accreditation set. Tuition $13,547-$21,713 per year. Strong fit for tech-industry, diplomatic and remote-work expat families seeking established IB-track education in the Lisbon metropolitan area.
Key facts
- Curriculum: IB taught at Oeiras International School.
- Tuition: $13,547–$21,713/yr published in EUR, US$ equivalent.
- Avg class size: 16 (max 16) Lisbon international school · 460 students total.
- 50 nationalities top: American/British.
- Ages: Ages 5 to 18 school day starts at 8:15.
- Accreditations: IBO, CIS, NEASC plus 1 more.
460
50 (American/British)
16 avg / 16 max
Available
IBO, CIS, NEASC, ECIS
About Oeiras International School
Oeiras International School is committed to promoting a respectful community of independent and passionate lifelong learners who are aware of their roles and responsibilities in an ever-changing world. To this end, OIS offers a variety of learning experiences within a supportive and challenging environment of rigorous academic programmes.
| Item | Amount |
|---|---|
| Annual tuition (USD) | $13,547 – $21,713 |
| Annual tuition (EUR) | 13547-21713 |
| Fee year | 2025-2026 |
| True annual cost (with hidden fees)how we calculate | $19,280(+9%) |
| First-year total (with registration + deposit) | $20,780 |
| Cost position in Lisbon | 84th percentile(premium tier) |
IB
IB Diploma
98% pass rate
Chinese, French, Portuguese, Spanish, German
Varies depending on individual needs.
Yes
English as an Additional Language
8:15 – 15:45
Yes
Yes
Is Oeiras International School right for your family?
A School Fit Brief scores this school against your children's ages, learning needs, and budget — with hidden fee analysis, admissions timing, and a ranked shortlist of alternatives in Lisbon.
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At a Glance
Fee Position in Lisbon
Mid-rangeSchool Profile
Class Size
Student Diversity
Very diverse
Common: American/British
Estimated Real Cost
Tuition + registration, transport, uniform, exams
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Nearby Schools (within 5km)
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