Jan Kasl (born 31 December 1951) is a Czech architect and former politician who served as the Mayor of the City of Prague from 1998 to 2002, and who led the European Democrats from 2002 to 2006.

He is married for the second time with journalist Terezie Jungrová, his former media consultant and granddaughter of Ferdinand Peroutka.

Two months after the 2006 parliamentary elections (in which party won 2.1% of the vote but no seats) he decided to leave politics and return to his profession as an architect.

[4] In January 2014, Kasl was offered by ANO 2011 to serve as their lead candidate for the 2014 Prague municipal election.

[7] He is a member of the Prague Society for International Cooperation, an NGO whose main goals are networking and the development of a new generation of responsible, well-informed leaders and thinkers.