The men's 100 metres T13 event at the 2020 Summer Paralympics in Tokyo, took place on 29 August 2021.

The event was won for the fourth consecutive time by the legendary Irish T13 athlete Jason Smyth in his final Games.

The T13 category is for athletes with a moderate visual impairment.

Athletes in this category have a variety of visual impairments, but can typically recognize contours from a distance of 2 to 6 metres.

Athletes in this category do not typically require a guide.