2004 World Junior Championships in Athletics – Men's 400 metres

The men's 400 metres event at the 2004 World Junior Championships in Athletics was held in Grosseto, Italy, at Stadio Olimpico Carlo Zecchini on 13, 14 and 15 July.

Final
15 July

Semifinals
14 July

Heats
13 July

Participation
According to an unofficial count, 47 athletes from 39 countries participated in the event. • 🇦🇺 australia (2)

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• 🇧🇾 belarus (1)

• undefined (1)

• 🇧🇷 brazil (1)

• undefined (1)

• undefined (1)

• undefined (1)

• 🇩🇲 dominica (1)

• undefined (1)

• 🇫🇮 finland (1)

• 🇫🇷 france (1)

• 🇬🇮 gibraltar (1)

• 🇮🇹 italy (1)

• 🇯🇲 jamaica (2)

• 🇯🇵 japan (2)

• 🇲🇴 macao (1)

• 🇳🇦 namibia (1)

• undefined (1)

• 🇳🇿 new zealand (1)

• undefined (1)

• 🇵🇼 palau (1)

• 🇵🇦 panama (1)

• 🇵🇱 poland (2)

• undefined (1)

• 🇶🇦 qatar (1)

• 🇷🇴 romania (1)

• 🇷🇺 russia (2)

• undefined (1)

• 🇸🇰 slovakia (1)

• undefined (2)

• undefined (1)

• undefined (1)

• undefined (1)

• 🇹🇷 turkey (1)

• 🇺🇬 uganda (1)

• undefined (1)

• 🇺🇸 united states (2)

• 🇻🇪 venezuela (2)