The women's 400 metres at the 2015 World Championships in Athletics was held at the Beijing National Stadium on 24, 25 and 27 August.

[2][3] Allyson Felix was known as a 200 metres specialist, but two years earlier, her string of 200 meter championships was broken when she sustained a hamstring injury in the final.

This was her bid to win the one title she didn't have under her belt; in the same event at the 2011 World Championships, she narrowly lost to Amantle Montsho of Botswana.

With world leader Francena McCorory unable to qualify at the American Championships, Felix was the favorite.

[4] Shaunae Miller made a powerful rush to the finish, passing Jackson for the silver and gaining on Felix down the home stretch.