The 1990–91 UNLV Runnin' Rebels basketball team represented the University of Nevada, Las Vegas in NCAA Division I men's competition in the 1990–91 season. The Runnin' Rebels, coached by Jerry Tarkanian, entered the season as defending national champions and entered the 1991 NCAA tournament unbeaten, but lost in the national semifinal to eventual champions Duke. They had been the last team to finish the regular season undefeated before Wichita State did it in 2014.
The team played its home games in the Thomas & Mack Center, and was a member of the Big West Conference; it would join the Western Athletic Conference in 1996 and become a charter member of its current conference, the Mountain West Conference, in 1999.
The nickname "Runnin' Rebels" is unique to men's basketball at UNLV. The default nickname for men's sports teams at the school is simply "Rebels", while all women's teams are known as "Lady Rebels".
NCAA basketball tournament
- UNLV 99, Montana 65
- UNLV 62, Georgetown 54
- UNLV 83, Utah 66
- UNLV 77, Seton Hall 65
- Final Four
Awards and honors
Team players drafted into the NBA