The Rankings — 2026/27
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Independent · Unpaid · Editorial
World's Top Schools, Ranked.
Every ranked and candidate school in the directory, one continuous list from #1 down. Use this view when you want the full picture without switching between tiers.
This ranking is locked. The next ranking update will be on September 1, 2027. How the ranking cycle works · Why this ranking exists
Penny's picks
Thailand · Nonthaburi
International School Bangkok
Opened in 1951 as Thailand's first international school, it pioneered the country's IB Diploma and runs a wilderness campus in Phetchaburi.
74.6
Score
Thailand · Nakhon Pathom Province
Mahidol Wittayanusorn School
On Mahidol University's Salaya campus, Thailand's first specialized science school pairs a full state scholarship with a mandatory research project for every student.
74.3
Score
Thailand · Bangkok
Triam Udom Suksa School
Born in 1938 as Chulalongkorn University's feeder school, where roughly 14,000 teenagers now compete yearly for 1,520 places.
74.0
Score
Thailand · Bangkok
Shrewsbury International School Bangkok
BSO · OutstandingA 1552 English public-school pedigree anchors a Chao Phraya riverside campus reachable by its own school boat.
73.6
Score
Thailand · Bangkok
Bangkok Patana School
BSO · OutstandingThailand's first British school, running since 1957, blends English curriculum grounding with IB breadth across a 17-hectare Bang Na campus.
72.4
Score
Thailand · Bangkok
NIST International School
Founded in 1992 with United Nations backing, Thailand's first not-for-profit IB World School sits amid downtown Sukhumvit.
71.8
Score
Thailand · Don Muang
Harrow International School Bangkok
The first Harrow campus outside Britain, where a private lake hosts dragon-boat races and a six-house system still defines school life.
71.2
Score
Thailand · Bangkok
Suankularb Wittayalai School
Founded by King Chulalongkorn in 1882, this all-boys Bangkok school remains Thailand's oldest public secondary institution.
71.2
Score
Thailand · Koh Kaew
British International School Phuket
Eight boarding houses and four sport academies sit across a 44-acre tropical campus pairing British curriculum with the IB Diploma.
70.9
Score
Thailand · Thalang
UWC Thailand International School
In the foothills of a Phuket national park, an IB continuum school pairs coral-reef fieldwork with mindfulness woven into daily lessons.
68.0
Score
Thailand · Bangkok
Satit Patumwan Demonstration School
Thailand's oldest laboratory school, born in 1953 as the country's first co-educational secondary, still teaching steps from Chulalongkorn University's gates
66.0
Score
Thailand · Bangkok
Assumption College
An all-boys Bang Rak school founded in 1885, the third-oldest secondary institution in Thailand, run by the Brothers of St. Gabriel.
65.0
Score
Thailand · Bangkok
Satit Chulalongkorn Demonstration School
A laboratory school on Chulalongkorn University's campus, whose 2012 PISA scores topped Singapore and Hong Kong.
64.8
Score
Thailand · Bangkok
Vajiravudh College
Royal-founded historic Thai boarding school modelled on English public schools; strong prestige and alumni depth.
62.2
Score
Thailand · Bangkok
Ruamrudee International School
Since 1957, a Redemptorist Catholic ethos in eastern Bangkok backs a hybrid diploma blending IB, AP and American coursework.
62.0
Score
Thailand · Bangkok
Debsirin School
Founded on temple grounds by royal decree in 1885, this Bangkok boys' school still fields one of Thailand's oldest football rivalries.
61.6
Score
Thailand · Rayong
Kamnoetvidya Science Academy
In Rayong's PTT-backed Wang Chan Valley research park, full scholarships fund a boarding school that admits 70 of 5,000 STEM applicants.
61.5
Score
Thailand · Chang Klan
Chiang Mai International School
Founded by returning missionaries in 1954, this Ping River campus was Thailand's first international school outside Bangkok.
61.4
Score
Thailand · Mae Rim
Prem Tinsulanonda International School
On a 100-acre farm and forest campus in the Mae Rim foothills, the first school in Southeast Asia to run all four IB programmes
61.4
Score
Thailand · Bangkok
Saint Gabriel's College
Since 1920, this all-boys Catholic institution in Dusit has paired an intensive English programme with famously narrow admission odds.
61.3
Score
Thailand · Bangkok
KIS International School
Bangkok's only school running the full IB continuum, PYP to Career-related, with Diploma scores averaging five points above the world mean.
57.3
Score
Thailand · Pathum Thani
Princess Chulabhorn Science High School Pathum Thani
One of eighteen royally chartered science schools pairing Thailand's top math-science talent with research partners in Japan.
57.1
Score
Thailand · Bangkok
Mater Dei School
An Ursuline all-girls campus off Ploenchit Road, where graduating classes carry sequential batch numbers dating to 1930.
56.1
Score
Thailand · Bangkok
Satriwithaya School
Founded in 1900 beside Bangkok's Democracy Monument, a century-old all-girls institution rooted in the city's historic Phra Nakhon core.
55.9
Score
Thailand · Bangkok
International Community School Bangkok
Born from a 1980s missionary-family cooperative, this Bang Na campus pairs 24 AP courses with mandatory service trips across Thailand.
54.5
Score
Thailand · Pattanakarn
Regents International School Bangkok
British curriculum through IGCSE gives way to the IB Diploma at Sixth Form, a pairing rare among Bangkok's boarding schools.
53.8
Score
Thailand · Nakhon Pathom
Young Artist Music Program (YAMP), Mahidol University
At Thailand's first music school, pre-college students devote 70 percent of class time to private lessons and ensemble performance.
53.5
Score
Thailand · Bangkok
Wellington College International Bangkok
The 1859 Berkshire house system replanted on a 28-acre Bangkok campus, complete with golf greens and an Olympic pool.
52.9
Score
Thailand · Bangkok
Bangkok Christian College
Since 1852, this all-boys school in Bangkok's Si Lom district remains Thailand's oldest, still fielding in the storied Jaturamitr rivalry.
52.7
Score
Thailand · Chonburi
Rugby School Thailand
The birthplace of rugby football's sister campus takes root in Chonburi, backed by rare double Beacon-status boarding.
51.6
Score
Thailand · Samut Prakan Province
Concordian International School
Where English-Chinese immersion meets full IB rigor, the only trilingual PYP-MYP-DP campus on Bangna-Trad Road.
48.8
Score
Thailand · Bangkok
King's College International School Bangkok
Southeast Asia's first King's Wimbledon offshoot pairs British rigor with kindness and good manners on Ratchada-Rama 3.
46.2
Score
Methodology
How we rank
Our composite weights eight categories. Each is scored 0–100 by our editorial panel and audited against 30 sub-criteria drawn from school records, university placement audits, alumni surveys, campus visits and parent interviews. Schools cannot pay for placement or preview scores.
Weighting
- Academic Outcomes20%
- University Placement17%
- Prestige & Heritage13%
- Alumni Network13%
- Facilities13%
- Transparency & Communications8%
- Peer & Industry Review10%
- Admissions Selectivity & Demand8%
Score key
Reading the scores
Bands out of 100
Every category, sub-criterion and composite total across this issue uses the same six-band editorial palette. Bands are calibrated against the full 300-school cohort — a "Distinguished" mark is meaningfully harder to earn than a "Strong" one.
- Exceptional90–100
Top of cohort
- Distinguished80–89
Elite tier
- Strong70–79
Consistently high
- Solid60–69
Reliable performer
- Average50–59
Room to grow
- Below par< 50
Underperforming
The same colour bands are used inside each school profile, on category chips, radar charts and the annual score-history line — so a colour glimpsed on the Rankings page always means the same thing everywhere else.
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