Seoul International School
🇰🇷 Seoul · Founded 1973 · American · Ages 5–18
A long-established, WASC-accredited American college-preparatory school in greater Seoul, strong on Advanced Placement breadth (including AP Capstone) but with a distinctive non-Korean residency requirement that narrows who can enroll.
Curricula
American
Age range
5–18
Languages of instruction
English
Annual fees
SGD KRW 31,991,809–39,374,690
Boarding
No (day school)
Accreditations
WASC
Tier Profile
We only tier dimensions backed by a public inspection verdict or verifiable accreditation. Other dimensions show a data flag — never a guessed score.
BrightKey's Assessment
Seoul International School (SIS) opened in 1973 as the first foreign school after Korean liberation to be fully recognised by the ROK Ministry of Education (license issued 5 June 1973), founded by Edward B. Adams as a secular, college-preparatory institution free of political or religious affiliation. It is located not in central Seoul but in Seongnam (Sujeong-gu, Gyeonggi-do), on an eight-acre campus occupied since May 1985, in the greater-Seoul metropolitan area.
The school delivers an American K-12 curriculum in an English-only environment, spanning Elementary, Middle, and High School divisions. The college-prep pathway is built on Advanced Placement: Wikipedia reports 22+ AP courses plus the AP Capstone Diploma (Seminar and Research) introduced in 2016–17. There is no IB Diploma Programme at SIS — this is the principal differentiator from peer Seoul schools.
SIS has held continuous WASC accreditation since 1979, with documented reaccreditations through 2015 and 2021. A notable enrolment constraint: the school's stated policy is that every student must hold non-Korean permanent residency or citizenship, which materially shapes the community. Foreign-language offerings are Chinese and Spanish.
South Korea has no public inspectorate for foreign schools, so the tier reflects accreditation depth (WASC) — capped at A.
Why These Ratings?
Inspection & AccreditationA — Excellent
Long, continuous WASC accreditation (since 1979, renewed through 2021), publicly documented. No IB/Cambridge stream. South Korea has no public inspectorate, so the tier reflects accreditation depth — A.
Strengths & Trade-offs
Strengths
- Deep AP program (22+ courses, school-reported) plus AP Capstone Diploma pathway
- Long, continuous WASC accreditation (since 1979, renewed through 2021)
- 50+ year track record; first MoE-recognised foreign school post-liberation
- Small class sizes (high school ~12–20; ~15 average reported 2017–18)
- Purpose-built eight-acre campus with ongoing facility investment (2013 building, 2019 library upgrades)
Trade-offs
- No IB pathway — purely AP/American, less flexibility for IB-seeking families
- Non-Korean residency/citizenship requirement excludes many local families
- AP exam results / pass rates are not published publicly
- EAL/ESL support not described publicly despite an English-only environment — unclear provision for non-native speakers
- Seongnam location is outside central Seoul (a commute consideration)
- A 2018 embezzlement investigation involving a former headmaster is on the public record
Is It Right For You?
Best For
- ✓Families holding non-Korean citizenship/PR seeking a US-curriculum, college-prep path
- ✓Students targeting US universities via a broad AP slate
- ✓Families wanting a small-class, established-community environment
Not Ideal For
- ✕Families specifically seeking the IB Diploma Programme
- ✕Korean nationals without qualifying foreign residency
- ✕Students needing extensive, clearly-documented EAL support
- ✕Families wanting a central-Seoul campus
Curriculum
American K-12 in an English-only environment. High school college prep centred on Advanced Placement; Wikipedia reports 22+ AP courses and the AP Capstone Diploma (Seminar/Research, from 2016–17). No IB programme offered. Foreign languages: Chinese and Spanish.
Fees
Yearly tuition 2025/26 reported at KRW 31,991,809–39,374,690 per international-schools-database.com; the official fee schedule was not directly captured. Verify directly with the school.
Admissions
Applications via the PowerSchool portal. Notable requirement (school-reported via Wikipedia): every student must hold non-Korean permanent residency or citizenship.
Campus Life
Eight-acre Seongnam campus occupied since 1985 with continued investment (1997 annex, 2013 seven-storey building, 2019 library/infrastructure). Tiger mascot; orange and black colours; 'TIGERS' values framework.
University Placement
School-reported · not independently verified
School-reported, unverified: no AP exam results, score distributions, or university-placement statistics are published in the sources accessed.
Sources
Every verifiable fact carries a public source — verify it yourself.
- Seoul International School — official site · 2026-06
- SIS — official history page · 2026-06
- Wikipedia — Seoul International School · 2026-06
- International Schools Database — Seoul · 2026-06
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