Science Olympiads: Mathematics, Physics, Chemistry, Informatics, Biology, Astronomy, Linguistics
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International Science Olympiads

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International science olympiads are intended for (senior) pupils at secondary schools all over the world.
IMO [official site]
The International Mathematical Olympiad (since 1959; not held in 1980)
A delegation consists of two leaders and six students.

IPhO [official site]
The International Physics Olympiad (since 1967; not held in 1973, 1978, 1980)
A delegation consists of two leaders and five students.

IChO [official site]
The International Chemistry Olympiad (since 1968; not held in 1971)
A delegation consists of two leaders and four students.

IBO [official site]
The International Biology Olympiad (since 1990)
A delegation consists of two leaders and four students.

IOI [official site]
The International Olympiad in Informatics (since 1989)
A delegation consists of two leaders and four students.

Of related interest:
IAO [official site]
The International Astronomy Olympiad (since 1996)

IGEO [official site]
The International Geography Olympiad (every other year since 1996) is organised by the International Geographical Union (IGU) Olympiad Task Force.

The International Linguistic Olympiad (since 2003)

IPO [ Alternative site ]
International Philosophy Olympiad (since 1993)

Another overview of International Science Olympiads can be found at the site of Pod-Moscowny (Moscow-Regional) Branch of M. V. Lomonosov Moscow State University.

Regional Science Olympiads

European Union Science Olympiad
The European Union Science Olympiad (EUSO) is a team competition for EU second level school science students who are 16 years of age or younger on the December 31st prior to the competition.

The two-part competition is spread over two days with an interval of at least one day and the recommended duration of each part is four hours. Each competition task is a practical activity incorporating elements of Biology, Chemistry and Physics in approximate equal proportions.

IEO (in German)
International Electrotechnical Olympiad in the Euro-region Neisse (since 1995)

National Science Olympiads

Below are some links to national olympiad pages that cover more than one science. For information on national olympiads for one particular science X, see the page on the international olympiad for X.
The Australian Science Olympiads (ASO) cover physics, chemistry, and biology. The Australian Mathematics Trust (AMT) covers mathematics and informatics.

Belgium (in Flemish)
This site covers Flemish competitions in Biology, Chemistry, and Physics.

This site covers Bulgarian competitions in Mathematics and Informatics. It is maintained by Petar Kenderov (, Ljubomir Davidov (, and Emil Kelevedzhiev (

The WWW Home Page for the Colombian Olympiads (in Spanish), covering Mathematics, Phyisics, and Informatics, maintained by Fernando Vega Salamanca (

The Young Scholar Club organizes the Iranian science olympiads.

The Irish Science Olympiad (ISO) covers Biology, Chemistry, Computer Programming and Physics. The winners represent Ireland at the IBO, IChO, IOI, IPhO and EUSO.

The Netherlands has national olympiads in Mathematics, Physics, Chemistry, Biology, Informatics, Astronomy, Linguistics, and Geography.

The Association of Swiss Science Olympiads (ASSO) coordinates Swiss olympiads in Biology, Chemistry, Informatics, Mathematics, and Physics.

The Turkmenistan Science Olympiads (currently not in English).

Science on WWW

IOI Secretariat /

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