| Election Name: | 2004 European Parliament election in Belgium |
| Country: | Belgium |
| Type: | parliamentary |
| Previous Election: | 1999 European Parliament election in Belgium |
| Previous Year: | 1999 |
| Next Election: | 2009 European Parliament election in Belgium |
| Next Year: | 2009 |
| Seats For Election: | 24 seats to the European Parliament |
| Election Date: | 13 June 2004 |
| Leader1: | Jean-Luc Dehaene |
| Party1: | Christian Democratic and Flemish |
| Alliance1: | European People's Party |
| Last Election1: | 3 seats, 13.49% |
| Seats1: | 4 |
| Seat Change1: | 1 |
| Popular Vote1: | 1,131,119 |
| Percentage1: | 17.43% |
| Swing1: | 3.94% |
| Leader2: | Frank Vanhecke |
| Party2: | Vlaams Blok |
| Last Election2: | 2 seats, 9.39% |
| Seats2: | 3 |
| Seat Change2: | 1 |
| Popular Vote2: | 930,731 |
| Percentage2: | 14.43% |
| Swing2: | 4.95% |
| Leader4: | Guy Verhofstadt |
| Party4: | Flemish Liberals and Democrats |
| Alliance4: | Alliance of Liberals and Democrats for Europe Party |
| Last Election4: | 3 seats, 13.61% |
| Seats4: | 3 |
| Popular Vote4: | 880,279 |
| Percentage4: | 13.56% |
| Swing4: | 1.13% |
| Leader5: | Elio Di Rupo |
| Party5: | Socialist Party (francophone Belgium) |
| Alliance5: | Party of European Socialists |
| Last Election5: | 3 seats, 9.59% |
| Seats5: | 4 |
| Seat Change5: | 1 |
| Popular Vote5: | 878,577 |
| Percentage5: | 13.54% |
| Swing5: | 3.95% |
Elections to the European Parliament were held in Belgium on 13 June 2004. The elections produced little overall change in the distribution of seats in the European Parliament among Belgium's many political parties. The two socialist parties improved their vote, while the Green parties lost ground. The Flemish nationalist party the Flemish Bloc (Vlaams Blok) registered the largest gains.
See main article: List of candidates in the 2004 European Parliament election in Belgium.