Ákos Császár (born 26 February 1924, Budapest) is a Hungarian mathematician, specializing in general topology and real analysis. He discovered the Császár polyhedron, a nonconvex polyhedron without diagonals. He introduced the notion of syntopogeneous spaces, a generalization of topological spaces.
During the end of 1944 his grandfather lost his life during the siege of Budapest. Then his father, older brother and himself were arrested by the conquerors and sent in a concentration camp approximatively 45 miles East of Budapest. An infectious illness spread in the camp and his brother and father died but Ákos survived. He is a member of the group of five students of the late professor Lipót Fejér who called them "The Big Five". Four members of the group are retired mathematics professors in North America and only Császár became a university professor in Budapest.
Between 1952 and 1992 he was head of the Department of Analysis at the Eötvös Loránd University, Budapest. Corresponding member (1970), member (1979) of the Hungarian Academy of Sciences. He has been general secretary (1966–1980), president (1980–1990), honorary president (since 1990) of the János Bolyai Mathematical Society. He received the Kossuth Prize (1963) and the Gold Medal of the Hungarian Academy of Sciences (2009).
- Á. Császár: A polyhedron without diagonals, Acta Sci. Math. Szeged, 13(1949), 140–142.
- Á. Császár: Foundations of general topology, A Pergamon Press Book The Macmillan Co., New York 1963 xix+380 pp.
- Á. Császár: General topology, Translated from the Hungarian by Klára Császár. Adam Hilger Ltd., Bristol, 1978. 488 pp. ISBN 0-85274-275-4
- Peterson, Ivars (December 2009). "A Polyhedron with a Hole". Science News. Retrieved 23 January 2010.
- "Members of HAS". Hungarian Academy of Sciences. Retrieved 23 January 2010.
- "Kossuth-díjasok". Retrieved 23 January 2010.
- "General Assembly Adjourns". Hungarian Academy of Sciences. 2009-05-05. Retrieved 23 January 2010.
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