The 2019–20 Louisiana Ragin' Cajuns men's basketball team represented the University of Louisiana at Lafayette during the 2019–20 NCAA Division I men's basketball season.

The Ragin' Cajuns, led by tenth-year head coach Bob Marlin played their home games at the Cajundome as members of the Sun Belt Conference.

They defeated Arkansas State in the first round of the Sun Belt tournament before losing in the second round to Georgia Southern.

The Cajuns proceeded to the Sun Belt Conference Men's Basketball Tournament with a first-round bye.

They ultimately lost to the South Alabama Jaguars in heartbreaking fashion by the score of 69–70 in the second round.