May 15, 2004 (Saturday)
- A 145 mm artillery shell is used as an improvised bomb on a road against US troops in Iraq. The shell explodes and two soldiers receive mild exposure to a nerve agent. (Fox News) (Seattle Post-Intelligencer)
- Ukraine wins the 49th annual Eurovision Song Contest. (BBC)
- FIFA announces that the 2010 Football World Cup will be held in South Africa. (BBC)
- Smarty Jones wins the Preakness Stakes by 12 lengths. (AP)
- Arsenal defeat Leicester City 2-1 in the Premier League to become the first team to go unbeaten in the top tier English league since Preston North End in the 1888-1889 season, going 26W-12D-0L. (BBC)