2000 World Junior Championships in Athletics – Men's 400 metres

The men's 400 metres event at the 2000 World Junior Championships in Athletics was held in Santiago, Chile, at Estadio Nacional Julio Martínez Prádanos on 17, 18 and 20 October.

Final
20 October

Semifinals
18 October

Heats
17 October

Participation
According to an unofficial count, 42 athletes from 34 countries participated in the event. • 🇦🇮 anguilla (1)

• 🇦🇺 australia (2)

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• undefined (1)

• undefined (1)

• undefined (1)

• undefined (1)

• 🇫🇷 france (1)

• 🇩🇪 germany (2)

• 🇬🇺 guam (1)

• undefined (1)

• 🇭🇰 hong kong (1)

• 🇭🇺 hungary (1)

• 🇮🇪 ireland (1)

• 🇯🇲 jamaica (1)

• 🇯🇵 japan (2)

• 🇰🇪 kenya (1)

• undefined (1)

• 🇲🇦 morocco (1)

• 🇳🇿 new zealand (1)

• undefined (1)

• 🇵🇱 poland (1)

• undefined (1)

• 🇷🇴 romania (1)

• 🇷🇺 russia (1)

• undefined (1)

• 🇱🇨 saint lucia (1)

• undefined (2)

• undefined (2)

• 🇪🇸 spain (1)

• undefined (2)

• 🇺🇦 ukraine (1)

• 🇺🇸 united states (2)

• 🇻🇪 venezuela (2)