List of International Mathematical Olympiads

The oldest of the International Science Olympiads, the IMO has since been held annually, except in 1980.

That year, the competition initially planned to be held in Mongolia was cancelled due to the Soviet invasion of Afghanistan.

Seven countries entered – Bulgaria, Czechoslovakia, East Germany, Hungary, Poland, Romania and the Soviet Union – with the hosts finishing as the top-ranked nation.

[7][8]) There have been other disqualifications of contestants due to cheating, but such cases are not officially made public.

[9] In January 2011, Google gave €1 million to the IMO organization to help cover the costs of the events from 2011 to 2015.

A circle, interlinked with a sideways figure of eight (lemniscate). The circle is half green and half yellow, the lemniscate is a third red, a third blue and a third black. The shapes are featured in front of a white background.
Logo of the International Mathematical Olympiad
Four men in black suits with bluish-white dress shirts and brightly coloured ties standing in front of a wall composed of wooden panels.
The four perfect scorers in the 2001 IMO. From left to right: Gabriel Carroll , Reid Barton , Zhiqiang Zhang, and Liang Xiao.
Ten people facing forward, in two lines of five. In the front row are five boys in their late teens. Behind them are four adults, and one person who appears to be in his late teens.
The Bangladesh team at the 2009 IMO
Six boys, standing on a line, all wearing white tops with red logos on their chest. They are holding a red, blue and white striped flag, which features a prominent crown and coat of arms.
Serbia's team for the 2010 IMO
The closing ceremony of the 2015 IMO