Elections to the European Parliament were held in Poland on 13 June 2004.

The elections resulted in a heavy defeat for the governing Alliance of the Democratic Left and Labor Union parties, although the very low turnout makes a direct comparison with national election results difficult.

Second place was taken by the strongly anti-EU League of Polish Families.

The radical populist Self-Defence of the Republic of Poland, which some opinion polls had predicted would come second, came fourth after the Law and Justice party.

The election results were a success for Social Democracy of Poland, which managed to cross the required 5% threshold, and the Freedom Union, which got over twice the expected percentage of votes.