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.
ILO: The International Linguistic Olympiad (since 2003)
IPO [ Alternative site ]: International Philosophy Olympiad (since 1993)

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

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