1990 World Junior Championships in Athletics – Men's 400 metres hurdles

The men's 400 metres hurdles event at the 1990 World Junior Championships in Athletics was held in Plovdiv, Bulgaria, at Deveti Septemvri Stadium on 8, 9 and 10 August.

Final
10 August

Semifinals
9 August

Heats
8 August

Participation
According to an unofficial count, 29 athletes from 23 countries participated in the event. • 🇦🇺 australia (2)

• 🇦🇹 austria (1)

• 🇧🇪 belgium (1)

• 🇧🇬 bulgaria (1)

• 🇨🇦 canada (1)

• undefined (1)

• 🇨🇺 cuba (2)

• 🇨🇾 cyprus (1)

• undefined (1)

• 🇫🇷 france (1)

• undefined (1)

• 🇮🇹 italy (2)

• 🇯🇲 jamaica (1)

• 🇯🇵 japan (2)

• 🇰🇪 kenya (1)

• 🇲🇦 morocco (1)

• 🇳🇦 namibia (1)

• undefined (1)

• undefined (2)

• 🇪🇸 spain (2)

• 🇺🇸 united states (1)

• undefined (1)

• undefined (1)