These are the official results of the Women's 400 metres event at the 1999 IAAF World Championships in

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. 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.

Final

Semi-final

*Held on Tuesday 24 August 1999

Quarter-finals

*Held on Monday 23 August 1999

Heats

*Held on Tuesday 24 August 1999

References

{{DEFAULTSORT:1999 World Championships In Athletics - Women's 400 Metres Events at the 1999 World Championships in Athletics, H 400 metres at the World Athletics Championships 1999 in women's athletics