2004 World Junior Championships in Athletics – Men's 4 × 400 metres relay

The men's 4x400 metres relay event at the 2004 World Junior Championships in Athletics was held in Grosseto, Italy, at Stadio Olimpico Carlo Zecchini on 17 and 18 July.

Final
18 July

Heats
17 July

Participation
According to an unofficial count, 81 athletes from 19 countries participated in the event. • 🇦🇺 australia (5)

• undefined (4)

• 🇧🇷 brazil (4)

• undefined (4)

• 🇫🇷 france (4)

• 🇩🇪 germany (5)

• 🇮🇹 italy (4)

• 🇯🇲 jamaica (4)

• 🇯🇵 japan (4)

• 🇳🇿 new zealand (4)

• 🇵🇱 poland (4)

• undefined (4)

• 🇷🇺 russia (4)

• undefined (5)

• undefined (4)

• 🇹🇷 turkey (4)

• 🇺🇬 uganda (4)

• undefined (4)

• 🇺🇸 united states (6)