The 2019–20 Lamar Cardinals basketball team represented Lamar University during the 2019–20 NCAA Division I men's basketball season. The Cardinals were led by sixth-year head coach Tic Price and played their home games at the Montagne Center in Beaumont, Texas as members of the Southland Conference. They finished the season 17–15, 10–10 in Southland play to finish in a three-way tie for sixth place. They defeated McNeese State in the first round of the Southland tournament and were set to face Nicholls in the second round before the tournament was cancelled amid the COVID-19 pandemic.