The 2004–05 Polish Cup was the fifty-first season of the annual Polish cup competition.
It began on 24 July 2004 with the Preliminary Round and ended on 21 June 2005 with second leg of the Final, played at Stadion Zagłębia Lubin, Lubin.
Lech Poznań were the defending champions.
The matches took place between 21 September and 5 December 2004.
won 2–1 on aggregate, but on 2 September 2020, they were deprived of this title in connection with proven cases of corruption and the trophy was not awarded to any team.