| 27th European Aquatics Championships | |
| Hostcity: |  Madrid, Spain |
| Dates: | 5–16 May 2004 |
| Venues: | M86 Swimming Center |
| Events: | 58 |
| Previous: | 2002 Berlin |
| Next: | 2006 Budapest |
The 2004 LEN European Championships were held in Madrid, Spain from 5 - 16 May, at the M86 Swimming Center in the southeast of the city. The championships brought together the European Championships in swimming (long course), open water swimming, diving and synchronised swimming. Since the event was held less than three months before the Summer Olympics in Athens, Greece, some of the participating nations used the event therefore as a qualifying tournament for the Olympics.
| 5 km open water | ||||
| 10 km open water | ||||
| 25 km open water |
| 5 km open water | ||||
| 10 km open water | ||||
| 25 km open water |
| 1 m springboard |  Joona PuhakkaFinland |  Nicola MarconiItaly | Tobias Schellenberg Germany | |
| 3 m springboard | Andreas Wels Germany | Joona Puhakka Finland |  Vassiliy LisovskiyRussia | |
| 10 m platform |  Anton ZakharovUkraine | Heiko Meyer Germany | Roman Volodkov Ukraine | |
| 3 m springboard synchro | Nicola Marconi Tommaso Marconi Italy | Sergey Anikin Vassiliy Lisovskiy Russia | Dmytro Lysenko Yuriy Shlyakhov Ukraine | |
| 10 m platform synchro | Anton Zakharov Roman Volodkov Ukraine | Tony Adam Heiko Meyer Germany Oleg VikulovKonstantin Khanbekov Russia | none |
| 1 m springboard | Heike Fischer Germany | Natalya Umyskova Russia | Tania Cagnotto Italy | |
| 3 m springboard | Yuliya Pakhalina Russia | Vera Ilyina Russia | Olena Fedorova Ukraine | |
| 10 m platform | Tania Cagnotto Italy | Olena Zhupina Ukraine | Valentina Marocchi Italy | |
| 3 m springboard synchro | Vera Ilyina Yuliya Pakhalina Russia | Ditte Kotzian Conny Schmalfuß Germany | Olena Fedorova Kristina Ishchenko Ukraine | |
| 10 m platform synchro | Nora Subschinski Annett Gamm Germany | Dolores Saez de Ibarra Leire Santos Spain | Brenda Spaziani Valentina Marocchi Italy |
