The 2020–21 James Madison Dukes men's basketball team represented James Madison University in the 2020–21 NCAA Division I men's basketball season.

The Dukes, led by first-year head coach Mark Byington, played their home games at the newly opened Atlantic Union Bank Center[1] in Harrisonburg, Virginia as members of the Colonial Athletic Association.

Byington was named the CAA Coach of the Year while guard Matt Lewis was named the CAA Player of the Year.

[4] Guard Matt Lewis opted to test the waters in the 2020 NBA draft, however he ultimately returned to the Dukes for his senior season.

[5] In the preseason CAA poll, the Dukes were picked to finish ninth while Matt Lewis was chosen the preseason CAA Player of the Year.