The 2020–21 Louisiana Ragin' Cajuns men's basketball team represented the University of Louisiana at Lafayette during the 2020–21 NCAA Division I men's basketball season. The Ragin' Cajuns, led by eleventh-year head coach Bob Marlin, played their home games at the Cajundome as members of the Sun Belt Conference. With the creation of divisions to cut down on travel due to the COVID-19 pandemic, they played in the West Division.