The men's 800 metres T34 event at the 2020 Summer Paralympics in Tokyo, took place between 3 and 4 September 2021.

The T34 category is for wheelchair athletes with cerebral palsy.

Athletes in this category have minimal limitations or control problems in their arms and trunk while pushing a wheelchair.

Prior to the competition, the existing records were as follows:[1] Heat 1 took place on 3 September 2021, at 11:29:[2] Heat 2 took place on 3 September 2021, at 11:36:[3] The final took place on 4 September 2021, at 9:55:[4]

This Paralympics-related article is a stub.