1999 World Championships in Athletics – Women's 400 metres

These are the official results of the Women's 400 metres event at the 1999 IAAF World Championships in Seville, Spain. There were a total number of 52 participating athletes, with seven qualifying heats, four quarter-finals, two semi-finals and the final held on Thursday 26 August 1999 at 20:30h.

Semi-final

 * Held on Tuesday 24 August 1999

Quarter-finals

 * Held on Monday 23 August 1999

Heats

 * Held on Tuesday 24 August 1999