NIST International School
🇹🇭 Bangkok · Founded 1992 · IB · Ages 3–18
Bangkok's original full IB-continuum World School — a not-for-profit, parent-governed institution with deep diplomatic-community roots and dual CIS/NEASC accreditation, delivering one of Thailand's most established and academically credible international programmes.
Curricula
IB
Age range
3–18
Languages of instruction
English
Annual fees
SGD THB 628,200–1,094,500
Enrollment
1,800
Boarding
No (day school)
IB authorised
PYP, MYP, DP
Accreditations
CIS, NEASC, ISAT, EARCOS
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
NIST International School opened on 13 August 1992 with 502 students, established through the efforts of United Nations families seeking a multicultural, non-national-curriculum education in Bangkok. It is governed as a not-for-profit by the parent-elected NIST International School Foundation, with tuition reinvested into operations rather than distributed as profit — a structural distinction the school emphasises. The campus sits at 36 Sukhumvit Soi 15 in the Asok district, accessible by BTS and MRT.
Academically, NIST runs the full IB continuum — PYP (3–11), MYP (11–16) and DP (16–19) — and was the first full IB World School in Thailand, completing all three programmes by 1999. It supplements the IB DP with a NIST Diploma, the Global Citizen Diploma, and the Duke of Edinburgh's International Award. The school publishes an average IB Diploma score of 37 and a 100% DP pass rate.
NIST serves roughly 1,800+ students from 90+ nationalities, reflecting its diplomatic and expatriate base. English is the language of instruction, supported by an English Language Support / EAL programme, World Languages, and 12 home languages available during the school day; the school states 56% of graduates earn a bilingual IB diploma. It is a day school — no boarding.
Thailand has no public school inspectorate, so NIST carries no official government rating. Its credibility rests on accreditation depth — dual CIS and NEASC accreditation plus IB authorisation — supporting an A tier (capped at A given the absence of a public inspectorate).
Why These Ratings?
Inspection & AccreditationA — Excellent
Dual CIS + NEASC accreditation plus full IB-continuum authorisation, corroborated across multiple sources. Thailand has no public inspectorate, so the tier reflects accreditation depth — A.
Strengths & Trade-offs
Strengths
- Full IB continuum (PYP + MYP + DP) — first and longest-established full IB World School in Thailand (since 1992)
- Dual CIS + NEASC international accreditation — strong external quality assurance in a country with no public inspectorate
- Published IB DP average of 37 with a 100% pass rate (school-reported but specific and consistent)
- Genuine not-for-profit, parent-governed foundation model — fees reinvested, not extracted
- Strong language inclusion: EAL/English Language Support, World Languages, 12 home languages, 56% bilingual-diploma graduation rate
- Highly diverse, diplomatically-connected community (90+ nationalities) with extensive co-curriculars
Trade-offs
- Tuition is not published on the official website — fee transparency relies on third-party databases (verify directly)
- No public government inspection rating exists for Thai schools, so external validation depends solely on accreditation
- IB average (37) and pass-rate figures are school-reported, not independently audited
- Single-curriculum (IB only) — no A-Level / AP / national alternative
- Conflicting public founding date ('Since 1999' tagline vs 1992 actual founding) creates minor data ambiguity
Is It Right For You?
Best For
- ✓Families committed to a single, coherent IB pathway from early years through Diploma
- ✓Diplomatic / expatriate / mobile families wanting IB transferability and a multinational peer community
- ✓Students who would benefit from strong EAL and multilingual / home-language support
- ✓Parents who value a not-for-profit, mission-driven governance model
Not Ideal For
- ✕Families seeking British A-Level, American AP, or a national-curriculum option
- ✕Families needing boarding (NIST is day-only)
- ✕Those requiring upfront published fee certainty before enquiry
- ✕Families wanting an independently inspected/government-rated school (not available anywhere in Thailand)
Curriculum
Full IB continuum: PYP (3–11), MYP (11–16), DP (16–19), all authorised. Supplemented by the NIST Diploma, Global Citizen Diploma, and Duke of Edinburgh's International Award. No Cambridge/A-Level or AP track.
Fees
NIST does not publish tuition on its official website (it directs enquiries to admissions). The International Schools Database lists a 2025/26 range of approximately THB 628,200–1,094,500 per year depending on grade level. Treat as indicative and verify directly with the school.
Admissions
Day-school admissions managed via the NIST admissions office; fees and places confirmed on enquiry. As a not-for-profit foundation school, governance is via the parent-elected NIST International School Foundation.
Campus Life
Single urban campus at 36 Sukhumvit Soi 15, Asok, Bangkok (BTS/MRT-accessible). 1,800+ students, 90+ nationalities, 300+ co-curricular activities and 45 student-led service groups.
University Placement
School-reported · not independently verified
School-reported, unverified: NIST maintains a University Counselling function and publishes a 'University Offers' page, but no specific destination institutions or matriculation figures were publicly available to verify.
Sources
Every verifiable fact carries a public source — verify it yourself.
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