Fundamenta Mathematicae is a scientific journal of mathematics with a special focus on the foundations of mathematics. At present, it concentrates on papers devoted to set theory, mathematical logic, topology and its interactions with algebra, and dynamical systems. The journal is published by the Mathematics Institute of the Polish Academy of Sciences.
It was a brainchild of Zygmunt Janiszewski and founded in 1920 by the Polish mathematicians Wacław Sierpiński, Stefan Mazurkiewicz, and Janiszewski, and published in Warsaw. Soon thereafter they were joined by Kazimierz Kuratowski, and later by Karol Borsuk. Originally the journal was devoted only to topology, set theory and foundations of mathematics. It was the first specialized journal in the history of mathematics.