The Mathematical Pupil Society "Leonhard Euler" (MSG) is an extra-curricular, free institution for the promotion of mathematically interested and talented secondary school students based at the Institute for Mathematics at Humboldt University Berlin in cooperation with other Berlin universities, currently the Technische Universität Berlin, Freie Universität Berlin and Hochschule für Technik und Wirtschaft.

Since 1970, the Mathematical Pupil Society "Leonhard Euler" has been supporting mathematically interested and talented students. In more than 20 weekly courses, the approx. 250 participants from grades 5 to 12 gain exciting insights into various areas of mathematics beyond the subject matter of the school. The focus is on problem-oriented work, scientific methods and training for mathematical competitions.

The members of the MSG meet weekly for two hours for regular circular work. The circles take place in the premises of Berlin universities and some Berlin schools -- especially here at the FU Berlin at the Institute of Mathematics (c/o Prof. Günter M. Ziegler); they are led by staff of the universities, by students of Berlin universities, by (partly former) teachers of Berlin schools and other mathematics enthusiasts.