2018 Atlantic Sun Men's Basketball Tournament
The 2018 Atlantic Sun Men's Basketball Tournament was the conference postseason tournament for the Atlantic Sun Conference. The tournament was the 39th year the league has conducted a postseason tournament. The tournament was held February 26, March 1, and 4, 2018 at campus sites of the higher seeds. Lipscomb defeated regular season champion Florida Gulf Coast in the tournament championship to receive the conference's automatic bid to the NCAA Tournament, the school's first trip to the NCAA Tournament.
Seeds
Teams were seeded by record within the conference, with a tiebreaker system to seed teams with identical conference records.| Seed | School | Conference | Tiebreaker |
| 1 | Florida Gulf Coast | 12–2 | |
| 2 | Lipscomb | 10–4 | |
| 3 | Jacksonville | 8–6 | |
| 4 | NJIT | 7–7 | 1–1 vs. UNF, 0–2 vs. FGCU, 1–1 vs. LU, 1–1 vs. JU |
| 5 | North Florida | 7–7 | 1–1 vs. NJIT, 0–2 vs. FGCU, 1–1 vs. LU, 0–2 vs. JU |
| 6 | Kennesaw State | 6–8 | |
| 7 | Stetson | 4–10 | |
| 8 | USC Upstate | 2–12 |