Jouko Antero Väänänen (born September 3, 1950 in Rovaniemi, Lapland)[1] is a Finnish mathematical logician known for his contributions to set theory,[2][3][4][5] model theory,[6][7][8] logic[9][10][11] and foundations of mathematics.

[14][15] He completed his PhD at the University of Manchester under the supervision of Peter Aczel in 1977 with the PhD thesis entitled "Applications of set theory to generalized quantifiers".

[16] He was elected to the Finnish Academy of Science and Letters in 2002.

[17] He served as a member of the Senate of the University of Helsinki from 2004 to 2006 and the Treasurer of the European Mathematical Society from 2007 to 2014,[18] as well as the Treasurer of the European Set Theory Society [19] since 2012.

Jouko Väänänen received the Magnus Ehrnrooth Foundation Prize in mathematics on April 29, 2024.