2018 IAAF World U20 Championships – Men's 4 × 100 metres relay

The men's 4 × 100 metres relay at the 2018 IAAF World U20 Championships was held at Ratina Stadium on 13 and 14 July.

Heats
Qualification: First 2 of each heat ( Q ) plus the 2 fastest times ( q ) qualified for the final.