The International Chemistry Olympiad (IChO) is a prestigious international chemistry competition for high school students. The first IChO was held in 1968 in Czechoslovakia. It has gradually expanded to over 80 countries from all continents. The competition takes place each year organized by a different host country observing the regulations and traditions of the IChO.

This website is hosted by Eötvös Loránd University, Budapest for the IChO Steering Committee. The database is a portion of the extensive science olympiad results database compiled by Ádam Tichy-Rács from publicly available data. It is prohibited to use the data not in line with IChO regulations (i.e. to publish national rankings). The theme and design of the page is based on imo-official.org.