The 2003 Southland Conference men's basketball tournament took place March 10–14, 2003.
The quarterfinal and semifinal rounds were played at the home arena of the higher seeded-teams, with the championship game played at Bernard Johnson Coliseum in Huntsville, Texas.
[1] Top-seeded Sam Houston State won the championship game over second-seeded Stephen F. Austin, and earned the conference's automatic bid to the NCAA tournament.
[2] Donald Cole of Sam Houston State was named the tournament's MVP.
For the semifinal round, the remaining teams were reseeded.