International Olympiad on Astronomy and Astrophysics
 The International Olympiad on Astronomy and Astrophysics (IOAA) is an annual astronomy 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 website states that: IOAA is designed to be a truly international organization on Astronomy and Astrophysics competitions.