| Election Name: | 2004 European Parliament election in Poland |
| Country: | Poland |
| Type: | parliamentary |
| Ongoing: | no |
| Next Election: | 2009 European Parliament election in Poland |
| Next Year: | 2009 |
| Seats For Election: | 54 seats to the European Parliament |
| Election Date: | 13 June 2004 |
| Turnout: | 20.87% |
| Leader1: | Jerzy Buzek |
| Party1: | Civic Platform |
| Alliance1: | European People's Party |
| Seats1: | 15 seats |
| Popular Vote1: | 1,467,775 |
| Percentage1: | 24.1% |
| Leader2: | Mirosław Piotrowski |
| Party2: | League of Polish Families |
| Alliance2: | Independence/Democracy |
| Seats2: | 10 seats |
| Popular Vote2: | 969 689 |
| Percentage2: | 15.92% |
| Leader3: | Anna Fotyga |
| Party3: | Law and Justice |
| Alliance3: | Alliance for Europe of the Nations |
| Seats3: | 7 seats |
| Popular Vote3: | 771 858 |
| Percentage3: | 12.67% |
| Leader4: | Ryszard Czarnecki |
| Party4: | Self-Defense of the Republic of Poland |
| Alliance4: | AEN / PES |
| Seats4: | 6 seats |
| Popular Vote4: | 656 782 |
| Percentage4: | 10.78% |
| Leader5: | Lidia Geringer de Oedenberg |
| Party5: | Democratic Left Alliance (Poland) |
| Alliance5: | Party of European Socialists |
| Seats5: | 5 seats |
| Popular Vote5: | 569 311 |
| Percentage5: | 9.35% |
| Leader6: | Władysław Frasyniuk |
| Party6: | Freedom Union (Poland) |
| Alliance6: | Alliance of Liberals and Democrats for Europe |
| Seats6: | 4 seats |
| Popular Vote6: | 446 549 |
| Percentage6: | 7.33% |
| Leader7: | Janusz Wojciechowski |
| Party7: | Polish People's Party |
| Alliance7: | European People's Party |
| Seats7: | 4 seats |
| Popular Vote7: | 386 340 |
| Percentage7: | 6.34% |
| Leader8: | Dariusz Rosati |
| Party8: | Social Democracy of Poland |
| Alliance8: | Party of European Socialists |
| Seats8: | 3 seats |
| Popular Vote8: | 324 707 |
| Percentage8: | 5.33% |
Elections to the European Parliament were held in Poland on 13 June 2004. 20.87% of eligible citizens voted; of these, 97.33% of the votes cast were valid. 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. As expected the most successful party was the Civic Platform. 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.
| Polling firm | PO | LPR | PiS | SRP | UW | PSL | SDPL | Others | Lead | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Election results | 24.1% | 15.9% | 12.7% | 10.8% | 9.3% | 7.3% | 6.3% | 5.3% | 8.3% | 8.2% over LPR | |||
| PBS | 28% | 15% | 12% | 14% | 11% | 5% | 6% | 4% | 5% | 13% over LPR | |||
| TNS OBOP | 28.7% | 15.1% | 10.9% | 14.4% | 10.5% | 5.3% | 6.2% | 4.1% | 4.8% | 13.6% over LPR | |||
| Exit polls | |||||||||||||
| CBOS | 31% | 8% | 14% | 16% | 10% | 3% | 4% | 5% | 9% | 15% over SRP | |||
| PBS | 30% | 11% | 11% | 18% | 8% | 5% | 7% | 4% | 6% | 12% over SRP | |||
| TNS OBOP | 27% | 13% | 6% | 16% | 6% | 4% | 4% | – | 24% | 11% over SRP | |||
| Ipsos | 27% | 12.6% | 16.5% | 16.5% | 4.6% | 3.8% | 3.4% | 5% | 10.6% | 10.5% over SRP/PiS | |||
| Pentor | 26% | 11% | 12% | 23% | 8% | 3% | 6% | 6% | 5% | 3% over SRP | |||
| Primary election | 21.1% | 6.9% | 8.4% | 18.4% | 11.3% | 7.3% | 3.9% | 9% | 13.7% | 2.7% over SRP | |||