Lanna International School Thailand (Thai: โรงเรียนนานาชาติลานนา, RTGS: Rong Rian Nana Chat Lanna) is a British international school in Chiang Mai, Thailand.

Lanna is licensed by the Thai Ministry of Education and has been fully accredited by the Western Association of Schools and Colleges (WASC) since 2002.

[citation needed] Lanna is a member of the East Asia Regional Council of Overseas Schools (EARCOS).

In 2005 Lanna also gained the status of becoming a Cambridge University International Examination Centre.

[citation needed] Today, Lanna's 610+ students in Pre-Nursery through Year 13 represent over twenty nationalities and more than seventeen languages making it truly international, with students of diverse cultural and linguistic backgrounds.