2018 Horizon League Men's Basketball Tournament
The 2018 Horizon League Men's Basketball Tournament was the postseason men's basketball tournament for the Horizon League of the 2017–18 NCAA Division I men's basketball season. It was held from March 2 through March 6, 2018 at Little Caesars Arena in Detroit. The tournament was won by No. 2 seed Wright State, who defeated No. 8 seed Cleveland State in the championship game, and received the conference's automatic berth into the NCAA Tournament.
Seeds
All 10 teams participated in the tournament. The top six teams received a bye into the quarterfinals. Teams were seeded by record within the conference, with a tiebreaker system to seed teams with identical conference records.| Seed | School | Conference | Tiebreaker |
| 1 | Northern Kentucky | 15–3 | |
| 2 | Wright State | 14–4 | |
| 3 | UIC | 12–6 | |
| 4 | Oakland | 10–8 | |
| 5 | IUPUI | 8–10 | 2–0 vs. Milwaukee |
| 6 | Milwaukee | 8–10 | 0–2 vs. IUPUI |
| 7 | Green Bay | 7–11 | |
| 8 | Cleveland State | 6–12 | 1–1 vs. YSU, 0–2 vs. NKU, 1–1 vs. WSU |
| 9 | Youngstown State | 6–12 | 1–1 vs. CSU, 0–2 vs. NKU, 0–2 vs. WSU |
| 10 | Detroit | 4–14 |