Chiang Mai International School

One of Chiang Mai's oldest and most established schools, founded in 1954. American curriculum, K–12, with a Christian heritage — all faiths welcome. WASC-accredited, a member of EARCOS and NAIS, with AP courses and rigorous university preparation. It's also the school that comes up most often in local parent circles — consistently praised for its sense of community and diversity, and a frequent first choice even among families who've toured nearly everything else in town. One thing that stands out: children here tend to speak English with each other even when they share a first language — a sign of how genuinely mixed and immersive the environment is.