38th International Chemistry Olympiad (South Korea, 2006):Gyeongsan, July 8-11. Program, sponsors, geography, and press kit.
32th International Chemistry Olympiad (Denmark, 2000): Exams, preparatory problems and worked solutions, participating countries, results, and medallists.
35th International Chemistry Olympiad (Greece, 2003): Athens, 5-14 July 2003. Final results, history, program, syllabus, preparatory problems, and participating countries.
36th International Chemistry Olympiad (Germany, 2004): Kiel, July 18-27. Final results, daily news, organization, sponsors, geographic and touristic information.
37th International Chemistry Olympiad (Taiwan, 2005): Taipei, July 16-35. Program, news, participating countries, results, and regional information.
Association of the Chemistry Olympiad: Founded in Germany in 1992, aims to increase contact among former participants at the International Chemistry Olympiads.
IChO Mailing List: Only available to former IChO participants. Includes archives.
Indian Chemistry Olympiad: Site from the Homi Bhabha Centre For Science Education. Stages, papers, syllabus, references, photo gallery, past olympiad, and cell members.
International Chemistry Olympiad (IChO): Unofficial site with rules and regulations, sample questions, directory of links to official international and national chemistry olimpiad sites.
International Chemistry Olympiad - Wikipedia: Article about the structure, rules, and history of the IChO.
International Chemistry Olympiad Information Center: History, regulations, reports, minutes, and an index of IChO home pages.
Markku's IChO Home Page: Markku Ursin, from Finland, participated in the 27th IChO in China. The photo gallery is guaranteed to bring fond memories to those who participated in that year's olympiad.
The International Chemistry Olympiad '95: Personal page of Antti Niskanen's from Finland. Includes a list of participants contact information and personal pages.
United States National Chemistry Olympiad: Goals and history of the USNCO, and some past exams.