The men's long jump event was part of the track and field athletics programme at the 1920 Summer Olympics.

The event was won by William Petersson of Sweden, the first time an athlete not from the United States took gold in the long jump.

Sol Butler of the United States was the favorite; he had jumped 7.52 metres to win the U.S. Olympic trials.

[2] Belgium, Czechoslovakia, Monaco, and Switzerland each made their first appearance in the event.

The United States appeared for the sixth time, the only nation to have long jumpers at each of the Games so far.