2021 World Athletics U20 Championships – Women's 100 metres hurdles

The women's 100 metres hurdles at the 2021 World Athletics U20 Championships was held at the Kasarani Stadium on 20 and 21 August.

Heats
Qualification: First 4 of each heat (Q) and the 4 fastest times (q) qualified for the semifinals.

Wind: Heat 1: +0.2 m/s, Heat 2: -0.6 m/s, Heat 3: +0.1 m/s, Heat 4: +0.5 m/s, Heat 5: +0.2 m/s

Semifinals
Qualification: First 2 of each heat (Q) and the 2 fastest times (q) qualified for the final.

Wind: Heat 1: +0.3 m/s, Heat 2: +0.3 m/s, Heat 3: +0.3 m/s

Final
The final was held on 21 August at 16:00.

Wind: +0.8 m/s