Jiří Žák (born 24 June 1978) is a Czech kickboxer and Muay thai fighter.
[3] Žák participated in the 2009 March Souboj Titánů Cruiserweight tournament.
He defeated Milan Hrubý by KO in the semifinals, and Tomáš Šenkýř by a third-round TKO in the finals.
In 2010 he won the WFCA 82.5 kg title by a first-round TKO of Clifton Brown, and in 2011 the WFCA 86 kg title, through a unanimous decision win over Fred Sikking.
[6] During the Česko vs Chorvatsko event, Žák fought Ivan Stanić for the ISKA World Cruiserweight title.