| Year: | 2018 |
| Conference: | West Coast Conference |
| Division: | I |
| Gender: | Men's |
| Teams: | 10 |
| Arena: | Orleans Arena |
| City: | Paradise, Nevada |
| Champions: | Gonzaga |
| Titlecount: | 17th |
| Coach: | Mark Few |
| Coachcount: | 15th |
| Mvp: | Killian Tillie |
| Mvpteam: | Gonzaga |
The 2018 West Coast Conference men's basketball tournament was the postseason men's basketball tournament for the West Coast Conference for the 2017–18 season. All tournament games were played at the Orleans Arena in Paradise, Nevada, from March 2–6, 2018. Regular-season champion Gonzaga won the tournament and with it the conference's automatic bid to the NCAA tournament.
All ten teams in the West Coast Conference were eligible to compete in the conference tournament. The top six teams received a first-round bye. Teams were seeded by record within the conference, with a tiebreaker system to seed teams with identical conference records.
| Seed | School | Conference | Tiebreaker 1 | Tiebreaker 2 | |
|---|---|---|---|---|---|
| 1 | Gonzaga | 17–1 | |||
| 2 | Saint Mary's | 16–2 | |||
| 3 | BYU | 11–7 | |||
| 4 | San Francisco | 9–9 | 1–1 vs. SMC | ||
| 5 | Pacific | 9–9 | 0–2 vs. SMC | 2–0 vs. San Diego | |
| 6 | San Diego | 9–9 | 0–2 vs. SMC | 0–2 vs. Pacific | |
| 7 | Santa Clara | 8–10 | |||
| 8 | Loyola Marymount | 5–13 | |||
| 9 | Portland | 4–14 | |||
| 10 | Pepperdine | 2–16 |
| Game | Time[1] | Matchup | Score | Television | |
|---|---|---|---|---|---|
| First round – Friday, March 2 | |||||
| 1 | 6:00 pm | No. 8 Loyola Marymount vs No. 9 Portland | 78–72 | SPEC SN/NBCS CA/ROOT NW/ATT RM/TheW.tv | |
| 2 | 8:00 pm | No. 7 Santa Clara vs No. 10 Pepperdine | 69–85 | ||
| Quarterfinals – Saturday, March 3 | |||||
| 3 | 1:00 pm | No. 3 BYU vs No. 6 San Diego | 85–79 | SPEC SN/NBCS CA/ROOT NW/ATT RM/TheW.tv | |
| 4 | 3:00 pm | No. 4 San Francisco vs No. 5 Pacific | 71–70 OT | ||
| 5 | 7:00 pm | No. 1 Gonzaga vs No. 8 Loyola Marymount | 83–69 | ESPN2 | |
| 6 | 9:00 pm | No. 2 Saint Mary's vs No. 10 Pepperdine | 69–66 | ||
| Semifinals – Monday, March 5 | |||||
| 7 | 6:00 pm | No. 1 Gonzaga vs. No. 4 San Francisco | 88–60 | ESPN | |
| 8 | 8:30 pm | No. 2 Saint Mary's vs No. 3 BYU | 72–85 | ESPN2 | |
| Final – Tuesday, March 6 | |||||
| 9 | 6:00 pm | No. 1 Gonzaga vs No. 3 BYU | 74–54 | ESPN | |
| |||||
* indicates overtime period.