| Year: | 2013 |
| Conference: | Atlantic Sun |
| Division: | I |
| Gender: | Men's |
| Teams: | 8 |
| Arena: | Hawkins Arena |
| City: | Macon, Georgia |
| Champions: | Florida Gulf Coast |
| Titlecount: | 1st |
| Coach: | Andy Enfield |
| Coachcount: | 1st |
| Mvp: | Brett Comer |
| Mvpteam: | Florida Gulf Coast |
The 2013 Atlantic Sun men's basketball tournament took place from March 6–9, 2013 at Hawkins Arena in Macon, Georgia.
The A-Sun Championship was a four-day single-elimination tournament. The top eight teams (with the exception of Northern Kentucky) competed in the championship. As part of their transition to Division I from Division II, Northern Kentucky was not eligible for post season play until 2017, including the A-Sun tournament. The winner of the tournament earned the A-Sun's automatic bid into the 2013 NCAA tournament.
Defending champion Belmont was not in the tournament, as they moved to the Ohio Valley Conference for the 2012-13 season.