2020–21 Big West Conference men's basketball season

The 2020–21 Big West Conference men's basketball season began with practices in October 2020, followed by the start of the 2020–21 NCAA Division I men's basketball season in November. Conference play began in January 2021 and concluded in March 2021. Games against UC San Diego were counted as non-conference games as their results were not counted in the league standings during their transition period.

Preseason Awards
Preseason awards were announced by the league office on November 11, 2020.

Preseason men's basketball media poll
(First place votes in parentheses)
 * 1) UC Irvine (28) 270
 * 2) UC Santa Barbara (9) 254
 * 3) UC Davis (1) 182
 * 4) Hawaii 165
 * 5) UC Riverside 160
 * 6) Long Beach State 141
 * 7) CSU Bakersfield 117
 * 8) CSU Northridge 102
 * 9) Cal State Fullerton 95
 * 10) Cal Poly 54