1990–91 Gonzaga Bulldogs men's basketball team

The 1990–91 Gonzaga Bulldogs men's basketball team represented Gonzaga University in the West Coast Conference (WCC) during the 1990–91 NCAA Division I men's basketball season. Led by ninth-year head coach Dan Fitzgerald, the Bulldogs were .510 overall in the regular season (5–9 in WCC, sixth), and played their home games on campus at the Charlotte Y. Martin Centre in Spokane, Washington.

At the fifth conference tournament, the Zags lost again in the quarterfinals, this time to San Diego, to finish at .500. Their first tournament wins came a year later in 1992; they advanced to the final, but fell by three to top-seeded Pepperdine.

Postseason results
!colspan=6 style=| WCC tournament