Indian Chemistry Olympiad
- Site from the Homi Bhabha Centre For Science Education. Stages, papers, syllabus, references, photo gallery, past olympiad, and cell members.
- http://www.hbcse.tifr.res.in/olympiads/Data/ObjectType/s/subchem/viewObjectType

International Chemistry Olympiad - Wikipedia
- Article about the structure, rules, and history of the IChO.
- http://en.wikipedia.org/wiki/International_Chemistry_Olympiad

37th International Chemistry Olympiad (Taiwan, 2005)
- Taipei, July 16-35. Program, news, participating countries, results, and regional information.
- http://icho.chem.ntnu.edu.tw/

International Chemistry Olympiad (IChO)
- Unofficial site with rules and regulations, sample questions, directory of links to official international and national chemistry olimpiad sites.
- http://olympiads.win.tue.nl/icho/

35th International Chemistry Olympiad (Greece, 2003)
- Athens, 5-14 July 2003. Final results, history, program, syllabus, preparatory problems, and participating countries.
- http://www.35icho.uoa.gr/

United States National Chemistry Olympiad
- Goals and history of the USNCO, and some past exams.
- http://www.acs.org/portal/Chemistry?PID=acsdisplay.html&DOC=education\student\olympiad.html

The International Chemistry Olympiad '95
- Personal page of Antti Niskanen's from Finland. Includes a list of participants contact information and personal pages.
- http://www.hut.fi/~aniskane/IChO-pages.html

IChO Mailing List
- Only available to former IChO participants. Includes archives.
- http://groups.yahoo.com/group/icho/

International Chemistry Olympiad Information Center
- History, regulations, reports, minutes, and an index of IChO home pages.
- http://www.icho.sk/