The women's 400 metres hurdles at the 2017 World Championships in Athletics was held at the London Olympic Stadium on 7−8 and 10 August.

[1] Olympic champion Dalilah Muhammad (USA) duplicated her strategy by running aggressively from the start of the final, making up the stagger on Léa Sprunger (SUI) to her outside during the first turn and passing two-time defending champion Zuzana Hejnová (CZE) another lane over by the third hurdle.

The closest to keep pace with Muhammad was Kori Carter (USA) almost unnoticed out in lane 9.

But Carter closed quickly, passing Muhammad before the final hurdle and running powerfully to the finish for the win.

Also closing fast from two steps behind, Ristananna Tracey (JAM) caught Hejnová over the tenth hurdle and widened the gap for a clear bronze.