| Year: | 2018 |
| Conference: | Big West Conference |
| Division: | I |
| Gender: | Men's |
| Teams: | 8 |
| Arena: | Honda Center |
| City: | Anaheim, California |
| Champions: | Cal State Fullerton |
| Titlecount: | 3rd |
| Coach: | Dedrique Taylor |
| Coachcount: | 1st |
| Mvp: | Kyle Allman |
| Mvpteam: | Cal State Fullerton |
| Television: | Prime Ticket ESPNU ESPN2 |
The 2018 Big West Conference men's basketball tournament was the postseason men's basketball tournament for the Big West Conference of the 2017–18 NCAA Division I men's basketball season. It was held from March 8–10, 2018 at the Honda Center in Anaheim, California. No. 4 seed Cal State Fullerton defeated No. 3 seed UC Irvine in the championship game to win the tournament and receive the conference's automatic bid to the NCAA tournament.
The top eight conference teams were eligible for the tournament. Teams were seeded by record within the conference, with a tiebreaker system to seed teams with identical conference records. Teams were re-seeded after the quarterfinals.
| Seed | School | Conference | Tiebreaker | |
|---|---|---|---|---|
| 1 | 12–4 | |||
| 2 | 11–5 | 1–1 vs UC Davis | ||
| 3 | 11–5 | 0–2 vs UC Davis | ||
| 4 | 10–6 | |||
| 5 | 9–7 | |||
| 6 | 8–8 | |||
| 7 | 4–12 | 1–1 vs UC Santa Barbara | ||
| 8 | 4–12 | 0–2 vs UC Santa Barbara |
| Game | Time | Matchup | Score | Television | |
|---|---|---|---|---|---|
| Quarterfinals – Thursday, March 8 | |||||
| 1 | 12:00 pm | No. 1 UC Davis vs No. 8 UC Riverside | 70–66 | Fox Sports West/Prime Ticket | |
| 2 | 2:30 pm | No. 4 Cal State Fullerton vs No. 5 Long Beach State | 76–74 | ||
| 3 | 6:00 pm | No. 3 UC Irvine vs No. 6 Hawaii | 68–67 | ||
| 4 | 8:30 pm | No. 2 UC Santa Barbara vs No. 7 Cal Poly | 75–53 | ||
| Semifinals – Friday, March 9 | |||||
| 5 | 6:30 pm | No. 1 UC Davis vs No. 4 Cal State Fullerton | 52–55 | ESPNU | |
| 6 | 9:00 pm | No. 3 UC Irvine vs No. 2 UC Santa Barbara | 61–58 | ESPNU | |
| Championship – Saturday, March 10 | |||||
| 7 | 9:00 pm | No. 3 UC Irvine vs No. 4 Cal State Fullerton | 55–71 | ESPN2 | |
| Game times in PT. Rankings denote tournament seeding. All games held at Honda Center, Anaheim, California | |||||