"Which is the best international school in Japan?" has no single answer — the honest one is that Japan has a handful of genuinely excellent schools, most of them concentrated in Tokyo and Yokohama, and the best one for your family is decided by four things: your child's age, the curriculum you want them to finish, the city you will actually live in, and your budget. This guide lays out the real landscape so you can shortlist properly before you move.
Fees, grade availability and programmes change every year. Treat the figures here as indicative and confirm current details with each school directly.
TL;DR
- Tokyo and Yokohama have the depth — ASIJ, Saint Maur, YIS, Nishimachi, St. Mary's, Seisen, BST and more.
- Kansai, Nagoya and regional Japan have fewer schools but often better value and smaller classes.
- Budget ¥2M–¥3M a year in tuition, more like ¥3M–¥4M+ at the best-known Tokyo schools, plus one-off fees.
- Accreditation (WASC, CIS) and JCIS membership are more useful quality signals than any ranking list.
- Most international schools are not Article 1 schools — a real consideration for Japanese citizens.
- Boarding exists: UWC ISAK Japan (Karuizawa), Canadian Academy (Kobe), Hokkaido International School (Sapporo).
What "best" should actually mean
Ignore ranking listicles. The signals worth weighing:
- Accreditation — WASC, CIS or equivalent, and membership of the Japan Council of International Schools (JCIS). These mean the school has been externally examined, not just marketed.
- Curriculum continuity — can the school take your child all the way to graduation, or will you be moving them again in three years?
- Exit pathway — IB Diploma, US high school diploma with AP, or UK IGCSE/A-Level. Match this to where your child will apply to university.
- Japanese-language provision — schools differ enormously here. Nishimachi is known for a serious Japanese programme; others treat it as a light second language.
- Size and class structure — a one-class-per-grade school is intimate but fragile; a large campus offers more subjects and sports.
Tokyo and Yokohama
This is where the depth is, and where the fees are highest.
- The American School in Japan (ASIJ) — founded 1902, nursery to Grade 12, US curriculum with AP, on a large Chofu campus plus an early-learning centre in Roppongi. The default answer for many American families, and among the most expensive in the country.
- Saint Maur International School (Yokohama, Yamate) — founded 1872, the oldest international school in Japan and one of the oldest in the world. Co-ed K–12, IB alongside a Montessori early-years programme.
- Yokohama International School (YIS) — founded 1924 by Yokohama's foreign residents after the Great Kantō earthquake, and the second school in the modern era to use "international" in its name. Full IB continuum.
- Nishimachi International School (Minato) — founded 1949, K–9, US-style curriculum, widely respected for the strength of its Japanese language programme. Many families continue on to ASIJ or an IB school afterwards.
- St. Mary's International School (Setagaya) — founded 1954, Catholic, boys only, with both IB and AP pathways.
- Seisen International School (Setagaya) — Catholic, girls only, IB continuum from kindergarten to Grade 12.
- The British School in Tokyo (BST) — the main British-curriculum option, IGCSE and A-Level, generally more accessible on fees than ASIJ.
- K. International School Tokyo and Aoba-Japan International School — IB World Schools with strong reputations and, in Aoba's case, a notably international staff body.
If you will be commuting into central Tokyo, work out the school run before you sign a lease — Chofu, Setagaya and Yokohama are very different daily journeys.
Kansai — Kobe, Osaka, Kyoto
- Canadian Academy (Kobe, Rokko Island) — opened 1913 as the Canadian Methodist Academy, now PreK–Grade 12 with the full IB continuum and a boarding option. The strongest all-round choice in Kansai.
- Osaka International School of Kwansei Gakuin — IB PYP, MYP and Diploma, with the unusual advantage of sitting alongside a Japanese school on the same campus.
- Marist Brothers International School (Kobe) — smaller, long-established, American curriculum.
Central Japan — Nagoya and Nagano
- Nagoya International School — founded 1964, preschool through Grade 12, IB. Indicative 2026 tuition runs from about ¥2,038,000 for early learning to ¥3,026,000 in the final two years — mid-range by national standards for a full K–12 IB school.
- UWC ISAK Japan (Karuizawa, Nagano) — English-language IB boarding high school, roughly ages 15–18. Highly selective, genuinely international, and unusual in that a majority of students receive need-based financial aid — worth applying to even if the sticker price looks impossible.
- EtonHouse International School Karuizawa — English-medium day school for the early years and lower primary, using the IPC with a strong outdoor programme. See our full guide to EtonHouse International School Karuizawa.
Karuizawa is the one place outside the major metros where international schooling is a genuine draw rather than an afterthought — see Schools in Karuizawa for International Families.
Regional Japan
Fewer options, but real ones — and usually cheaper, smaller and more community-driven than Tokyo.
- Hiroshima International School — the only fully accredited IB school covering kindergarten to Grade 12 in the Chugoku region, for ages 3–18.
- Fukuoka International School — WASC-accredited, non-profit, PreK–Grade 12, IB, in Kyushu's largest city.
- Hokkaido International School (Sapporo) — around 200 students, PreK–Grade 12, day and boarding, using the International Primary and Middle Years Curricula with AP courses in high school.
- Okinawa Christian School International — American curriculum, preschool to Grade 12.
In a smaller city, check the school's enrolment trend, not just its prospectus. A regional school with falling numbers may not offer the same subject range in three years' time.
What it really costs
| Indicative annual tuition | |
|---|---|
| Best-known Tokyo schools (ASIJ and similar) | ¥3,000,000 – ¥4,500,000 |
| Mainstream Tokyo / Yokohama international schools | ¥2,400,000 – ¥3,000,000 |
| Regional IB and international schools | ¥1,800,000 – ¥2,600,000 |
| Early years / preschool programmes | ¥1,200,000 – ¥2,000,000 |
Then add the parts people forget: one-time enrolment or registration fees (often ¥200,000–¥1,000,000), capital levies at the larger schools, bus, lunch, uniform, trips and exam fees. Realistically, year one costs ¥500,000–¥1,500,000 more than the tuition line, with ¥300,000–¥800,000 recurring after that.
If an employer is paying, get the education allowance confirmed in writing — including whether it covers siblings and one-time fees, which is where packages usually fall short.
The Article 1 rule — read this if you are a Japanese citizen
Most international schools in Japan are registered as miscellaneous schools (各種学校), not Article 1 schools (一条校) under the School Education Act. Consequences:
- For foreign nationals, Japan's compulsory education obligation does not apply — international school is simply a choice.
- For Japanese citizens, attending a non-Article 1 school does not formally discharge the parental obligation to send a child to school. MEXT has not pursued this in practice for decades, and thousands of families do it, but it is worth understanding rather than discovering later.
- It also affects re-entry into the Japanese system and, in some cases, eligibility for public tuition support schemes.
Dual-national families in particular should ask each school directly how their students have handled transfers back into Japanese schools.
How to apply — and when
- Shortlist 3–5 schools against age, curriculum, commute and budget — not reputation alone.
- Contact admissions 12–18 months ahead for competitive Tokyo schools; 6–12 months is usually fine regionally.
- Visit. Every school photographs well. Sit in on a class if they will let you.
- Prepare the file — school reports, transcripts, any assessment reports, passports and residence details.
- Expect assessment and a family interview, especially in the early years.
- Accept the waitlist if offered. Top Tokyo schools waitlist strong applicants rather than reject them, and places open up through the year.
Living outside the big cities
Not every family wants Tokyo. If you are weighing a quieter base with real international schooling nearby, Karuizawa is the strongest case in Japan: a boarding IB high school, an English-medium day school for young children, a well-regarded progressive Japanese school, and a 70-minute shinkansen to Tokyo. Start with Moving to Karuizawa.
How ERISA helps
ERISA (有限会社えり紗) supports international families through school choice and the paperwork around it — interpreting at school tours and interviews, translating school reports and application documents, comparing international against local Japanese options honestly, and handling enrollment through the town hall for families who choose a local school. If you are relocating with children, get in touch — or read the full Karuizawa Guide.