2020–21 Marshall Thundering Herd men's basketball team

The 2020–21 Marshall Thundering Herd men's basketball team represented Marshall University during the 2020–21 NCAA Division I men's basketball season. The Thundering Herd, led by seventh-year head coach Dan D'Antoni, played their home games at the Cam Henderson Center as members of the East Division of Conference USA. They finished the season 15–7, 9–5 in C-USA play to finish in third place in the East Division. They were defeated in the second round of the C-USA tournament by Rice.

Previous season
The Thundering Herd finished the 2019–20 season 17–15, 10–8 in C-USA play to finish in sixth place. They defeated UTEP in the opening round of the C-USA tournament, and they were scheduled to play Louisiana Tech in the quarterfinals. However, the remainder of the tournament was canceled due to the coronavirus pandemic.

Schedule and results
!colspan=12 style=| Non-Conference Regular season

!colspan=9 style=| Conference USA regular season

!colspan=9 style=| Conference USA tournament