Abstract The International Chemistry Olympiad (IChO) is an annual competition for the world’s most talented chemistry students at the secondary school level. The goals for IChO are to promote international contacts in chemistry, friendships between young scientists of different nationalities, and the exchange of pedagogical and scientific experience in chemistry. The first Olympiad took place in Prague, Czechoslovakia, in 1968, with delegations from three countries. The number of participating countries has grown ever since. Thailand first participated in the 22 nd International Chemistry Olympiad, held in Paris, France, in 1990. Then, in 1999, Thailand received the great honor to host the 31 st International Chemistry Olympiad. Held in Bangkok, the 31 st IChO welcomed 196 students from 51 countries. In 2017, as part of the celebrations for Professor Dr. Her Royal Highness Princess Chulabhorn Mahidol’s 60 th birthday, Thailand hosted the 49 th Int
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