The 1990–91 Pepperdine Waves men's basketball team represented Pepperdine University in the 1990–91 NCAA Division I men's basketball season. The team was led by head coach Tom Asbury. The Waves played their home games at the Firestone Fieldhouse and were members of the West Coast Conference. They finished the season 22–9, 13–1 in WCC play to win the regular season conference title by a 4-game margin. After a January 11 home loss to San Diego in the conference opener, Pepperdine was just 6–8 overall. The Waves then went on a 16-game winning streak and won the West Coast Conference tournament to receive the conference's automatic bid to the NCAA tournament. In the opening round, the Waves fell to Seton Hall, 71–51.