2010 World Junior Championships in Athletics – Men's 4 × 100 metres relay

The men's 4x100 metres relay event at the 2010 World Junior Championships in Athletics was held in Moncton, New Brunswick, Canada, at Moncton Stadium on 23 and 24 July.

Final
24 July

Heats
23 July

Participation
According to an unofficial count, 91 athletes from 21 countries participated in the event. • 🇦🇺 australia (4)

• undefined (4)

• 🇧🇭 bahrain (4)

• 🇧🇪 belgium (4)

• 🇧🇷 brazil (4)

• 🇨🇦 canada (4)

• 🇨🇿 czech republic (4)

• 🇫🇷 france (4)

• 🇩🇪 germany (5)

• 🇯🇲 jamaica (5)

• 🇯🇵 japan (4)

• undefined (4)

• 🇵🇱 poland (4)

• undefined (4)

• undefined (4)

• 🇪🇸 spain (4)

• 🇹🇭 thailand (4)

• undefined (5)

• undefined (6)

• 🇺🇸 united states (6)

• undefined (4)