The men's 1500 metres event at the 2020 Summer Olympics took place between 3 and 7 August 2021 at the Japan National Stadium. Approximately fifty athletes were expected to compete; the exact number depended on how many nations used universality places to enter athletes in addition to the 45 qualifying through time or ranking. 47 competitors from 27 nations competed. Jakob Ingebrigtsen set a new Olympic record on his way to the gold medal, Norway's first medal in the men's 1500 metres. Timothy Cheruiyot of Kenya took silver, returning that nation to the podium for the first time since a four-Games medal streak ended in 2008. Josh Kerr earned bronze, Great Britain's first medal in the event since 1988.

Jakob Ingebrigtsen is a Norwegian middle- and long-distance runner. Ingebrigtsen is the current world record holder for the indoor 1500 metres and the 2000 metres, and holds the world best time over the two mile distance. Ingebrigtsen is a two-time World champion, winning gold medals in the 5000 metres in 2022 and 2023 and a four-time European champion, winning gold medals in the 1500 m and 5000 m in 2018 and 2022. He also won a gold medal in the 1500 m at the 2020 Tokyo Olympics, setting an Olympic and European record. In addition to the 1500 m, Ingebrigtsen holds European records in the mile and 5000 m, and is one of only three men to run a sub-3:30 1500 m, sub-7:30 3000 m and a sub-12:50 5000 m.