2020–21 Hawaii Rainbow Warriors basketball team

The 2020–21 Hawaii Rainbow Warriors basketball team represented the University of Hawaii at Manoa during the 2020–21 NCAA Division I men's basketball season. The Rainbow Warriors, led by sixth-year head coach Eran Ganot, played their home games at the Stan Sheriff Center in Honolulu, Hawaii. Hawaii was a member of the Big West Conference, and participated in their 9th season in that league.

Previous season
The Rainbow Warriors finished the 2019–20 season 17–13, 8–8 in Big West play to finish fourth place. However, they were unable to play a single game in the Big West Conference tournament due to the COVID-19 pandemic.

Media poll
The preseason poll was released on November 12, 2020. Hawaii was picked to finish fourth in the Big West Conference standings.

Preseason Big West Men's Basketball All-Conference Team
The Rainbow Warriors did not have anyone named to the preseason All-Conference Team.

Schedule and results
!colspan=9 style=| Non-conference regular season

!colspan=9 style=| Big West regular season

!colspan=12 style=| Big West tournament