Athletics at the 2004 Summer Olympics – Women's 400 metres

The women's 400 metres at the 2004 Summer Olympics as part of the athletics program were held at the Athens Olympic Stadium from August 21 to 24. The first round had split a full roster of runners into eight heats with the first three gaining a direct qualification and then the next six fastest across all heats advancing to the semifinals. The top two runners in each of the three semifinal heats moved on directly to the final, and they are immediately joined by the next two fastest from any of the semifinals.

Athletics at the 2004 Summer Olympics – Women's 400 metres

The women's 400 metres at the 2004 Summer Olympics as part of the athletics program were held at the Athens Olympic Stadium from August 21 to 24. The first round had split a full roster of runners into eight heats with the first three gaining a direct qualification and then the next six fastest across all heats advancing to the semifinals. The top two runners in each of the three semifinal heats moved on directly to the final, and they are immediately joined by the next two fastest from any of the semifinals.