2010 World Junior Championships in Athletics – Women's 400 metres hurdles

The women's 400 metres hurdles event at the 2010 World Junior Championships in Athletics was held in Moncton, New Brunswick, Canada, at Moncton Stadium on 22 and 24 July.

Final
24 July

Heats
22 July

Participation
According to an unofficial count, 22 athletes from 19 countries participated in the event. • 🇧🇾 belarus (1)

• 🇧🇯 benin (1)

• 🇨🇦 canada (2)

• 🇨🇿 czech republic (1)

• 🇩🇪 germany (1)

• 🇮🇪 ireland (1)

• 🇮🇹 italy (1)

• 🇯🇲 jamaica (2)

• 🇯🇵 japan (1)

• 🇰🇿 kazakhstan (1)

• 🇷🇴 romania (1)

• 🇷🇺 russia (1)

• undefined (1)

• undefined (1)

• 🇸🇪 sweden (1)

• undefined (1)

• 🇹🇳 tunisia (1)

• 🇺🇸 united states (2)

• undefined (1)