“International Olympiad of Astronomy and Astrophysics (IOAA) is an annual event for highly performed high school students from all around the world in the field of Astronomy and Astrophysics. Established in Thailand 2006, it was initiated by five countries including Thailand, Indonesia, Iran, China and Poland with the aim to proliferate Astronomy among high school students, to foster friendship among young astronomers at international level so as to build cooperation in the field of Astronomy in the future among the young scholars.”