The 2021 Sun Belt Conference men's basketball tournament was the postseason men's basketball tournament for Sun Belt Conference during the 2020–21 NCAA Division I men's basketball season.
[1] The winner received the Sun Belt's automatic bid to the 2021 NCAA tournament.
Due to the COVID-19 pandemic, teams were seeded by their place in their division.
The top two teams from each division received a bye into the quarterfinals.
* denotes overtime period 2021 Sun Belt Conference women's basketball tournament