The international science olympiads are competitions for (senior) pupils at secondary schools all over the world. They include:
- The International Mathematics Olympiad (IMO, since 1959; not held in 1980)
- The International Physics Olympiad (IPhO, since 1967; not held in 1973, 1978, 1980)
- The International Chemistry Olympiad (IChO, since 1968; not held in 1971)
- The International Biology Olympiad (IBO, since 1990)
- The International Olympiad in Informatics (IOI, since 1989)
- The International Astronomy Olympiad (IAO, since 1996)