This article shows the rosters of all participating teams at the men's basketball tournament at the 2020 Summer Olympics in Tokyo.
Group A
Czech Republic
The roster was announced on 8 July 2021.
France
The roster was announced on 21 May 2021.
Iran
The roster was announced on 3 July 2021.
United States
The roster was updated on July 16, 2021.
Group B
Australia
The roster was announced on 2 July 2021.
Germany
The roster was announced on 5 July 2021.
Italy
The roster was announced on 6 July 2021.
Nigeria
A 15-player roster was announced on 6 July 2021. The final squad was released on 20 July 2021.
Group C
Argentina
A 15-player roster was announced on 4 June 2021. The final squad was revealed on 18 July 2021.
Japan
The roster was announced on 5 July 2021.
Slovenia
The roster was announced on 17 July 2021.
Spain
A 16-player roster was announced on 6 July 2021. The final squad was revealed on 19 July 2021.