The men's hammer throw event at the 2020 Summer Olympics took place between 2 and 4 August 2021 at the Japan National Stadium.

Between them was Norwegian thrower Eivind Henriksen, with his silver being Norway's first-ever Olympic medal in the men's hammer.

Paweł Fajdek of Poland was the four-time reigning World Champion (2013, 2015, 2017, and 2019), qualified, and was a favorite in Tokyo.

No nations made their men's hammer throw debut, though Russian athletes competed as the "ROC" for the first time.

The United States appeared for the 27th time, most of any nation, having missed only the boycotted 1980 Games.

Due to the COVID-19 pandemic, the period was suspended from 6 April 2020 to 30 November 2020, with the end date extended to 29 June 2021.