The International Olympiad on Astronomy and Astrophysics (IOAA) is an annual Astronomy and Astrophysics competition for high school students. It is one of the international science olympiads.
The Olympiad was founded from a dissidence inside the International Astronomy Olympiad, in order to increase the scope of the organization.
The first IOAA was held in Chiang Mai, Thailand, in November/December 2007. The |language=en-US}}</ref>
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