The women's 400 metres at the 2018 IAAF World Indoor Championships took place on 2 and 3 March 2018.

[1][2] The two Americans with the fastest times in the semi-final round, Shakima Wimbley and Courtney Okolo were given the outer two lanes in the final, 5 and 6 respectively.

Wimbley started quickly, making up a little ground on Okolo's stagger, while Okolo took a more measured approach to her speed, putting on a burst just before the cones, then taking the tangent to lane 1 to take the lead unobstructed.

Wimbley closed in much sooner, forcing Eilidh Doyle to squeeze inside to take second position with a lap to go.

Okolo just continued to extend her lead, seven metres by the finish for a clear win.