| Year: | 2018 |
| Conference: | Summit League |
| Division: | I |
| Gender: | Men's |
| Teams: | 8 |
| Arena: | Denny Sanford Premier Center |
| City: | Sioux Falls, South Dakota |
| Champions: | South Dakota State |
| Titlecount: | 5th |
| Coach: | T. J. Otzelberger |
| Coachcount: | 2nd |
| Mvp: | Mike Daum |
| Mvpteam: | South Dakota State |
| Television: | Midco Sport Network, ESPN3, ESPN2 |
The 2018 Summit League men's basketball tournament was the postseason men's basketball tournament for the Summit League for the 2017–18 season. All tournament games were played at the Denny Sanford Premier Center in Sioux Falls, South Dakota, from March 3–6, 2018. Regular season champion South Dakota State defeated South Dakota in the championship game to win the tournament and receive the conference's automatic bid to the NCAA tournament.
All eight teams in the Summit League were eligible to compete in the conference tournament. Teams were seeded by record within the conference, with a tiebreaker system to seed teams with identical conference records.
| Seed | School | Conference | Tiebreaker | Tiebreaker 2 | Tiebreaker 3 |
|---|---|---|---|---|---|
| 1 | South Dakota State | 13–1 | |||
| 2 | South Dakota | 11–3 | |||
| 3 | Denver | 8–6 | |||
| 4 | Fort Wayne | 7–7 | |||
| 5 | North Dakota State | 5–9 | 1–1 vs ORU | 0–2 vs SDSU | 1–1 vs SD |
| 6 | Oral Roberts | 5–9 | 1–1 vs NDSU | 0–2 vs SDSU | 0–2 vs SD |
| 7 | Omaha | 4–10 | |||
| 8 | Western Illinois | 3–11 | |||
| Game | Time[1] | Matchup | Score | Television | |
|---|---|---|---|---|---|
| Quarterfinals – Saturday, March 3 | |||||
| 1 | 6:00 pm | No. 1 South Dakota State vs. No. 8 Western Illinois | 66–60 | ||
| 2 | 8:30 pm | No. 2 South Dakota vs. No. 7 Omaha | 87–73 | ||
| Quarterfinals – Sunday, March 4 | |||||
| 3 | 6:00 pm | No. 4 Fort Wayne vs. No. 5 North Dakota State | 82–86 | Midco Sport Network ESPN3 | |
| 4 | 8:30 pm | No. 3 Denver vs. No 6 Oral Roberts | 90–882OT | ||
| Semifinals – Monday, March 5 | |||||
| 5 | 6:00 pm | No. 1 South Dakota State vs. No. 5 North Dakota State | 78–57 | Midco Sport Network ESPN3 | |
| 6 | 8:30 pm | No. 2 South Dakota vs. No. 3 Denver | 76–58 | ||
| Final – Tuesday, March 6 | |||||
| 7 | 8:00 pm | No. 1 South Dakota State vs. No. 2 South Dakota | 97–87 | ESPN2 | |
| |||||
* indicates overtime period.