Founded
1998

First Harrow school outside the UK

Curriculum
British

EYFS → IGCSE → A-level; no IB

Years
18 months–18

~1,700–1,850 students; boarding from prep years

Location
Don Mueang

35-acre campus, north Bangkok

Structure
For-profit licence

Operated by AISL under licence from Harrow London

Inspection
BSO Outstanding

March 2023, all phases

The short version

The short version

Harrow International School Bangkok opened in 1998 as the first Harrow school outside the UK, and moved in 2003 to a purpose-built 35-acre campus in Don Mueang, north Bangkok. It teaches the English National Curriculum from an Early Years centre (entry from 18 months) through IGCSE to A-levels, with boarding in a four-house village.

Its March 2023 British Schools Overseas inspection judged it “an outstanding school” providing “an outstanding quality of education for pupils from 18 months to 18 years.”↗

For an expat family, the practical summary is this: Harrow is Bangkok’s British boarding option and one of its two A-level flagships, with an externally inspected quality verdict most Thai-market schools cannot show.

The structural facts to weigh are the for-profit licence model (AISL operates the school under licence from Harrow London), the Don Mueang location, and premium fees with a sizeable deposit.

What the school is

A licensed Harrow — and why the royal connection explains Bangkok

The choice of Bangkok for the first overseas Harrow was not arbitrary: 23 princes of the Thai royal household were educated at Harrow in London between the late nineteenth and late twentieth centuries, including Prince Mahidol.

The Bangkok school broke from the London template in two deliberate ways — it is co-educational, and it takes day pupils alongside boarders.↗

The governance fact every family should know: this is a licensed brand, not a branch. The 2023 BSO report lists the school as “Private.

For profit.” and names Asia International Schools Ltd (AISL) as proprietor; AISL documents describe a licence from Harrow School London held by Hong Kong businessman Daniel Chiu. The Harrow Foundation’s quality role is real but arms-length — two Foundation governors sit on the international schools’ boards and visit each Asian school three times a year.↗↗

Accreditations satisfy Thailand’s requirement for recognised overseas accreditation several times over: CIS since 2006, FOBISIA, ISAT and HMC memberships — and, unusually for Thailand, a published BSO inspection, the UK government framework that puts the school on the same evidential footing as a British independent school abroad.↗↗

Academics in practice

Inspected Outstanding — and 70% A*/A at A-level in 2025

The March 2023 BSO inspection — carried out by Education Development Trust inspectors and quality-assured by Ofsted — rated attainment and progress outstanding across all phases, recording 1,713 pupils on roll. This is the school’s strongest evidence: an external, published verdict, not a marketing claim.

Read the report itself rather than any summary, including this one.↗

Recent school-reported results: 70% A*–A at A-level (90% A*–B) and 71% A*–A at IGCSE (92% A*–B) in 2025; 2024 leavers recorded 91% securing first-choice destinations with 13% to QS top-10 institutions, including Stanford, Oxford, Imperial and Melbourne.

The model wraps academics in a “Leadership in Action” programme under the motto “Leadership for a better world” — service, expeditions, sport and arts as curriculum, not decoration.↗↗

Class sizes are reported as capped at 22 in Prep and IGCSE and 15 at A-level, and the school runs a free Language Support Department offering EAL from Pre-Nursery to Year 5 for up to three years — an unusually explicit commitment at the premium end.

As always with school-reported figures, ask for cohort sizes alongside percentages.↗

Fees and the real cost

2025/26 fees — and what boarding adds

Harrow’s 2025/26 tuition, as quoted by Thailand’s Board of Investment from the school’s schedule, runs from THB 553,100 (Pre-Nursery half day) to THB 1,037,100 in Years 12–13, with a THB 225,000 admission fee and a THB 200,000 refundable day-student deposit.

The 2023 BSO report separately recorded boarding fees of THB 413,000 (weekly) and THB 516,500 (full boarding) per year on top of tuition — confirm current boarding rates with the school.↗↗

The all-in first year for a day student in the senior school reaches roughly THB 1.5 million including one-time fees.

Add full boarding and the annual total approaches THB 1.55–1.6 million — competitive with sending a child to board in the UK once flights and guardianship are priced, which is precisely the comparison the school expects regional families to run. Bus fees are reported at THB 119,200–136,200 a year across 32 routes.↗↗

Admissions and boarding

Competitive entry, and Bangkok’s only real boarding option

Admission is described as competitive, combining entrance assessment, interview and a review of academic records, with the school looking beyond raw attainment at character and leadership fit — consistent with the Harrow model.

Boarding begins in the prep years across four houses (The Knoll, West Acre, Bradbys and The Grove); recent counts put boarders around 138 within total enrolment of roughly 1,850.↗↗

The boarding market context matters: Harrow has been effectively the only established full-boarding option for international families in Bangkok, drawing boarders from across Asia.

New competitors with boarding have been announced for 2026 openings elsewhere in the city, but none with Harrow’s track record — if boarding is your requirement, the question is less “which school” than “which house, and how full”.

The family experience

Don Mueang geography: choose the school, then the neighbourhood

The 35-acre lakeside campus sits in Don Mueang in Bangkok’s far north — a 45-to-60-minute peak drive from central Sukhumvit, and close to Don Mueang airport.

Facilities include a Creative and Performing Arts Centre with a Steinway recital hall, an eight-lane 25-metre pool, floodlit rugby and football pitches, six tennis courts, a climbing wall and a working lake used for sailing and dragon boating.↗

The school-run logic is well documented: many Harrow families live in the northern Bangkok corridor specifically because of the school, and for households in Pak Kret or northern Nonthaburi, Harrow is closer than NIST or Patana.

The decision sequence that works is school first, housing second — reversing it, and commuting from a Sukhumvit condo, makes the bus route the defining fact of your child’s day.↗

Our readConfidence: High

The inspected British flagship with boarding — on a licence, in the far north

Our confidence is High: Harrow Bangkok has a published, Ofsted-quality-assured BSO inspection rating it Outstanding — the strongest external evidence available for any school in Thailand — and its fees are on record in a Thai government publication.

The for-profit AISL licence structure is documented in the inspection report itself, so families can weigh it with eyes open rather than discover it later. What neither document can tell you is whether the Harrow ethos fits your child; that is a visit-day question.

The families Harrow suits: those wanting a British A-level pathway with boarding — the only established option in Bangkok — families in the northern corridor, and regional families across Asia who want UK-style boarding without the UK.

The families it suits less well: those who weight not-for-profit governance, those needing a central location without a bus commute, and IB or American pathway families. On the evidence available, it is the most externally validated school in the Thai market.

Take these to the school

Questions that move beyond the tour script

Admissions and boarding

  1. For our child’s year group and entry date, what does the assessment and interview process involve, and when should we apply?
  2. Which boarding houses have space for our child’s year group, and how are day students integrated with boarders?
  3. What are the current weekly and full boarding fees, and what do they include?

Academics and support

  1. May we see the full IGCSE and A-level results for the last three years with cohort sizes, and the university-destination list?
  2. How does the free EAL programme work in practice — how is need assessed, and what happens after the three-year window?
  3. How are A-level subjects timetabled, and are class-size caps guaranteed in writing?

Cost and logistics

  1. What is the full year-one cost for our child — admission fee, deposit, tuition, boarding or bus, uniform and trips?
  2. Which of the 32 bus routes serves our neighbourhood, and what is the actual morning journey time at peak?
  3. How do Harrow Foundation governor visits affect the school in practice — can we see recent quality-assurance outcomes?

Continue your research

Choose your next step

Sources and further research

Where to verify and keep reading

We favor direct links to the exact page or document a family may need next. Access dates matter because admissions, tuition, leadership, and programs change.