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:
 (gold medalist)
 (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. Group A

Group B

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

Badminton at the 2020 Summer Paralympics