The Middle European Mathematical Olympiad (MEMO) is the continuation of Austrian-Polish Mathematical Competition (APMC), held 29 times from 1978 to 2006. Now ten countries participate in the MEMO: Austria, Croatia, Czechia, Germany, Hungary, Lithuania, Poland, Slovakia, Slovenia and Switzerland.

Similar to the IMO, each country participates with at most six students and two team leaders. At a meeting of representatives of MEMO countries held in 2006 during the IMO it was pointed out that one of the goals of the new competition was to enable a larger number of students to gain experience in international competitions. Therefore, the teams participating in the MEMO are typically disjoint from the IMO teams. Also, in order for MEMO to help younger students prepare for some future International Mathematical Olympiad, students in their senior year are not eligible to be in the MEMO team.

The most important part of the MEMO are the individual and team competition, each lasting five hours. The problems are of the “olympic” type, typically divided into four areas: algebra, combinatorics, geometry and number theory. At the individual competition the students solve one problem from each area. The team competition test consists of eight problems, two from each area (although at the first two MEMOs the team competition also had only four problems). In the team competition the students solve the problems together, which gives the competition a very special atmosphere. The team part of the competition existed also at the APMC, but it is otherwise a rarity in mathematical competitions.

The whole program lasts for one week. Besides the individual and team competition, it contains excursions, entertainment and sports activities.

The 20th Middle European Mathematical Olympiad will be held in Celje, Slovenia, from 23th to 29th August 2026. About a hundred participants are expected, including 60 contestants and 20 team leaders and deputies. The main organiser of the 20th MEMO is The Society of Mathematicians, Physicists and Astronomers of Slovenia.