The men's 4 × 100 metres relay event was part of the track and field athletics programme at the 1920 Summer Olympics.

Fifty-two runners from 13 nations competed.

[1] These were the standing world and Olympic records (in seconds) prior to the 1920 Summer Olympics.

In the final the team of the United States set a new world record with 42.2 seconds.

The semi-finals were held on Saturday, August 21, 1920.