The men's light heavyweight boxing event at the 2020 Summer Olympics took place between 25 July and 4 August 2021 at the Ryōgoku Kokugikan.

The 2016 Olympic champion, Julio César La Cruz, had moved up to the heavyweight class for the 2020 Games.

[3] The 2016 Olympic champion in middleweight, Arlen López (also of Cuba), had moved up to light heavyweight and was competing in Tokyo.

A National Olympic Committee (NOC) could enter only 1 qualified boxer in the weight class.

Judges consider "number of blows landed on the target areas, domination of the bout, technique and tactical superiority and competitiveness."