Badminton at the 2020 Summer Paralympics – Men's singles SL3

The men's singles SL3 tournament at the 2020 Summer Paralympics in Tokyo took place between 1 and 4 September 2021 at Yoyogi National Gymnasium.

Seeds
These were the seeds for this event:
 * 1)  (gold medalist)
 * 2) (silver medalist)

Group stage
The draw of the group stage revealed on 26 August 2021. The group stage was played from 1 to 3 September. The top two winners of each group advanced to the knockout rounds.

Finals
The knockout stage was played from 4 to 5 September.