The Lamar Cardinals basketball team represents Lamar University in NCAA Division I men's basketball competition. The Cardinals currently play in the Southland Conference following a return from the Western Athletic Conference on July 11, 2022. They were one of four programs, all from Texas, that left the Southland Conference on July 1, 2021, to join the Western Athletic Conference (WAC). Lamar left the Southland Conference for the second time, having initially joined at the league's formation in 1963, left in 1987, and returned in 1999. After one season in the WAC, Lamar returned to the Southland Conference. The Cardinals have played home games in the Montagne Center since 1984.