Concordian International School Bangkok (Concordian)

Founded in 2001 in Bangkok's Bangna district, CIS operates as Thailand's only fully trilingual international school delivering the complete IB continuum from Pre-K through Grade 12. The school serves approximately 1,000 students aged 2-18 with a distinctive language progression that begins with English-Mandarin immersion in Early Years and Primary levels, then shifts to English-dominant instruction from Grade 5 while maintaining Thai language integration throughout. This trilingual approach distinguishes it from other Bangkok international schools that typically focus on bilingual education.

The 250-member teaching staff delivers IB Primary Years Programme through Grade 5, Middle Years Programme for Grades 6-10, and Diploma Programme in the final two years. Located on Bangna-Trad Highway, the campus serves a diverse international community while maintaining strong accreditation from the International Baccalaureate Organization, New England Association of Schools and Colleges, and Council of International Schools. The school's membership in regional organizations like ISAT and EARCOS reflects its integration within Southeast Asia's international education network.

Strengths

• Thailand's only fully trilingual IB school with English-Mandarin-Thai integration
• Complete IB continuum from Pre-K through Diploma Programme
• Strong international accreditation from IBO, NEASC, and CIS
• Two decades of educational experience since 2001 founding
• Substantial 1,000-student community with 250 teaching staff

Considerations

• Limited public information about specific IB results or university placement outcomes
• Annual fees starting at THB 608,200 with higher levels not publicly disclosed
• Language-intensive program may not suit all families' educational preferences
• Bangna location requires consideration of Bangkok traffic patterns for daily commuting

Academics

IB Diploma Results (Class of 2025): School Average Score: 36 points (World average: 30.58) Pass Rate: 100% IB Diploma Results (Class of 2024): School Average Score: 36 points (World average: 30.3) Students scoring 40+ points: 11 students University Destinations (2025 Highlights): UK: University College London (UCL), King's College London, University of Edinburgh, University of Manchester, University of Warwick, University of Bristol. USA: Georgia Institute of Technology, Boston University, Northeastern University, University of Wisconsin - Madison, University of California (Davis, Irvine, San Diego, Santa Barbara). Canada: University of Toronto, University of British Columbia, McGill University.

School life

Sports: Football, basketball, volleyball, swimming, golf, table tennis, badminton, tennis, squash, weight training, yoga, Shaolin Kung Fu. Competes in AISAA Sports League. Arts & Music: Choir, school band, piano, violin, drama, Thai dance, clay works, ballet, jazz/K-pop dance.

Campus Size: Not published (total acreage). Swimming Pools: 6-lane covered 50m pool, 6-lane 25m pool, and a separate wading pool for young students. Sports Halls: 3 large air-conditioned rubberized gymnasiums (accommodating 3 indoor basketball courts, 5 badminton courts, 4 indoor football courts, and 4 volleyball courts).

Student body

Total Enrolment: Approximately 1,100 students. Number of Nationalities: Over 10; approximately 80% are Thai, with others including American, Australian, Canadian, Chinese, Dutch, French, Israeli, Japanese, Korean, and Malaysian. Student-Teacher Ratio: 8:1.

• Concordian is described as Thailand's only fully trilingual IB school, with English, Mandarin and Thai delivered in immersion across PYP, MYP and DP. A Reddit comment summarised it as "Thailand's only trilingual school to offer a full IB education".
• Reddit teacher discussion places Concordian in Bangkok's tier-2 international band alongside St Andrews, King's College, Harrow and Bangkok Prep, with competitive teacher compensation reported.
• Parent commentary on directory pages credits the trilingual outcome: one parent said their daughter "learned English and Chinese (half day in each language) and became fluent in both, not only orally but in writing as well". Treat directory parent quotes as testimonial-leaning.
• Older International Schools Review forum threads flag historic concerns about owner-driven micromanagement and high overseas-teacher turnover. These are dated and may not reflect current operations.
• Bangna location east of central Bangkok is a recurring practical consideration; the school is well off the central expat track and most families relocate or commute via the Bang Na expressway.