International Science Olympiad
international annual competitions in various areas of the formal sciences, natural sciences, and social sciences; subgroup of science olympiads
International Linguistics Olympiad
International Science Olympiad
International Astronomy Olympiad
astronomy competition for high-school students
International Olympiad on Astronomy and Astrophysics
High school astronomy competition
International Mathematical Olympiad
mathematical olympiad for pre-university students
International Geography Olympiad
annual geography competition
International Earth Science Olympiad
annual competition for secondary school students
Japan Linguistics Olympiad
Japanese national competition for the ability to analyse an unknown language
International Physics Olympiad
physics competition for high-school students
International Junior Science Olympiad
International Junior Science Olympiad
International Philosophy Olympiad
philosophy competition for high school students
International Chemistry Olympiad
annual academic competition for high schoolers
European Physics Olympiad
Annual European student competition in physics.