The Mathematical Society of Serbia was founded in January 1948. During these 70 years of existence, the Society had a broad spectrum of activities: organization of scientific work, concerns for education, popularization of mathematics, etc. In the range of its activities we can quote the editing of five journals as well as a large number of various publications mostly assigned to young mathematician and programmers. The Society is the organizer of all competitions in mathematics and informatics in Serbia and its care is also preparation of Serbian teams for the participation at international competitions. Finally, through the Society, Serbian mathematicians realize their contacts with international associations. Our aim in this paper is to give a brief survey of activities the Society had in the time of its existence.