The 2018–19 Hawaii Rainbow Warriors basketball team represented the University of Hawaiʻi at Mānoa during the 2018–19 NCAA Division I men's basketball season. The Rainbow Warriors, led by fourth-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 7th season in that league. They finished the season 18-13, 9-7 in Big West play. They placed fourth in the conference, losing to Long Beach State in the quarterfinals of the Big West tournament. It was the second straight year Hawaii blew a double digit lead in the tournament en route to being eliminated in the quarterfinals for the third straight year. Despite being eligible, citing health and season length, the team declined