International Mathematical Olympiad
![The logo of the International Mathematical Olympiad.](/Images/godic/202501/26/IMO_logo.svg4453.png"){kind=logo}
![A stage in the process of solving a problem1 from the AIME, part of the US's selection process.](/Images/godic/202501/26/Geo_prob_diagram.svg4454.png")
![Members of the 2007 IMO Greek team.](/Images/godic/202501/26/IMO_20074454.jpg")
![From left to right, Gabriel Carroll, US, Reid Barton, US, Liang Xiao, China, and Zhiqiang Zhang, China, the four perfect scorers in the 2001 IMO held in the US.](/Images/godic/202501/26/Perfect-scorers4454.jpg")
The International Mathematical Olympiad (IMO) is an annual six-problem, 42-point mathematical olympiad for pre-collegiate students and is the oldest of the International Science Olympiads. The first IMO was held in Romania in 1959. It has since been held annually, except in 1980. About 100 countries send teams of up to six students, plus one team leader, one deputy leader, and observers.