2010 IAAF World Indoor Championships – Women's 400 metres

The women's 400 metres at the 2010 IAAF World Indoor Championships was held at the ASPIRE Dome on 12 and 13 March.

Qualification: First 2 in each heat (Q) and the next 4 fastest (q) advance to the semifinals.

Qualification: First 3 in each heat (Q) advance to the final.