Swimming at the 2020 Summer Olympics – Men's 4 × 100 metre freestyle relay
The men's 4 × 100 metre freestyle relay event at the 2020 Summer Olympics was held on 25 and 26 July 2021 at the Tokyo Aquatics Centre. It was the thirteenth appearance of the event, which has been held from 1964 to 1972 and then at every Games since 1984.